Correct, these 5 Ordo fights essentially are two parters, first part being frigate and destroyer (as well as Brilliant) spam, second part being Apex spam into multiple Radiants at once. It's the ultimate challenge for a ship because you must be able to handle everything. My strategy here even conveniently splits the fight into the two since I retreat in the middle to preserve CR and reset hull regeneration.
The suggestion about having different layouts for different phases of the fight is kind of interesting and I'm thinking about whether it's workable. There's one problem that the ship can handle a barrage of 2 Gauss and then vent, but it can't handle a 4 Gauss barrage for 5 seconds unless you add a lot of caps I think. These ships have 1225 dissipation, so you'll need 6000 more flux capacity to be able to fire the burst - that's 30 capacitors. So to make a ship with more kinetic firepower you'd have to give up range in one way or another by giving up a range enhancing skill or switching to a more efficient but shorter range gun, which is not great because Gauss is there specifically because shorter range guns falter in the Apex and Radiant phase (Apexes can back away and Radiants can outrange and kite you - you don't have ITU so your range outside LIDAR burst will be 1350, shorter than Tachyon + ITU even without skills, while with Gauss + skills you have 1800, note I'm assuming LIDAR boosts base range only in these calculations).
The main thing about this build is you have really limited choice for skills. Combat Endurance, Damage Control and Impact Mitigation are compulsory (what, you are not going to take -25% damage taken with extra perks? Even the Damage Control Reaper resistance is good here), likewise Target Analysis is always obligatory. So that leaves 2 skills. I'd argue you just go for the range and +damage on all of your guns. You might take Point Defense over Gunnery Implants if the +200 range works with Devastator + LIDAR though. Still I think the ships do in fact need and use all of their Gauss range, there is a lot of sniping going on in this video. For a good example see the Nova snipe at 03.19.
It shouldn't be necessary though as this fight could be won without losses if I had just micro'd the CGR Rewards of Devotion a little more actively out of the front line. It really shouldn't have been in the corner when it died. I'm also not certain, looking at it, that it couldn't be done just swapping the Resonator for a Locust. Just play it really well and be really sharp the whole time and never leave the tactical screen. Since the ships did have some fight left in them.
I'm not convinced about the shorter range guns because I did try with them, but I'll be very happy to be proven wrong about this! The fighters though, you could definitely test if Thunder is better. The thing they really need to do is keep flux up on Apexes and Radiants and I think the Broadswords do accomplish that to an extent looking at the video. At least in sim duels Thunders do in fact do it better though. Don't want to put anything with a shield in this fleet since shields are the devil.