The battle report from our side wasn't as bad as you're making out, any sort of stronghold assault is going to cost the attacker more than the defender so the ships lost comparison isn't a good metric.
We threw a lot of Battlecruisers in through the front door, which were obviously going to get shredded, but took out a fair few dreadnoughts in the process so that was fairly balanced. The 50bil difference was mainly down to a couple of failed T3 Cruiser assaults in one of the neighbouring systems which, as far as I can work out, at least one of was down to trying to use a fancy new tactic (sneak in with cloak fitted ships and then refit the same ship to full combat modules while out in space) for the first time during an actual operation with people who'd never done it before. It took too long to reconfigure the ships and the enemy had time to probe them down and catch them with their guns still in the packaging.
The second T3 loss I'm not 100% sure what happened. I watched the whole thing from my cloaked stealth bomber and it looked like they were just not aligned out of the combat zone so weren't ready to get out of the way when the Initiative Ishtars landed on them, which is a very odd mistake for an experienced FC to make. It was a "well that's that then" moment since without those ships the stealth bombers couldn't focus on removing the cyno jammers. We twiddled our thumbs for a bit, blew up an Initiative Muninn then jumped back home to join the main fleet.
The idea that this is a victory for the Imperium is pretty much down to the insane objective that PAPI set themselves of taking out every single piece of space they owned and "eradicating" them. So we're left in a situation where we pushed the enemy alliance back into a single constellation, glassed almost every structure they owned, made their home system difficult to live in with (incredibly fun) 23/7 black ops hit and run raids and apparently that's a loss. Presumably TEST was the mastermind behind the objective. Fucksakes, TEST.
For the last few weeks we've been told to get everything together for one last make or break assault into 1DQ and the amount of effort on the part of the line members, particularly the industry guys, in doing so has been amazing. I'm especially proud of BRAVE, my lot, who weren't all that involved in the war for a long while but made a huge push into moving ships in and having a giggle camping the 1DQ gate. Then the day of the invasion we made one assault then half the coalition said "fuck it" and ran away. TEST aren't popular within the BRAVE ranks right now and their attempt to spin the withdrawal as a tax thing aren't being taken seriously. It's hard to believe that this plan wasn't already in the works a few days ago too so the last few days of moving in equipment just to be evacuated again were a bit of a waste.
Still, BRAVE took the loss in the spirit I would expect of them and hopped into cheap Atron frigates, Cormorant destroyers and one carrier (since, to paraphrase, "I built it to explode in 1DQ so it's damn well going to explode in 1DQ") and stormed the gates one last time. We all died, obviously, but took out one last shiny Goon ship with us.
It sounds like the plan for BRAVE is to back away from these massive alliance of alliances sort of games and get back to its medium scale roots which I'm all for. The Goons are obviously going to smug it up and are talking a big game about taking their revenge on BRAVE which, again, I'm all for since I play this game purely to make bad guys explode. And if nothing else the Goons play a great bad guy.