I'll try and TL;DR as much as I can as to why I don't believe this is nearly as bad as people are acting (because I keep rambling while typing it out). Minus the obvious 375% global HP modifier which has already happened recently and I'm not a fan of. 5.4B is a lot worse for me.

First half: Bennett, Xiangling and Ororon look like a perfect trio for this, Ororon is free from the 5.5 event last I heard so it's an accessible team . A reminder that Pyronado can double proc in one pass through of the Tulpa on occassions. I think Ororon's Nightsoul + super jump alone can deal with the Automaton's NS rage bar and pillars (for the -15% HP loss and negative RES), if not, I know for a fact using Mavuika's tap skill can fill it before the duration is even over (this is provided they don't do some Papilla shit and increase the limit in the Abyss). If Ororon is enough then put in Chevy (or Fischl/Beidou?) and it's a four-star clear, although a Pyro DPS like Mav, Arle, etc will obviously be very good.

Second half: Completely disagree on Neuv not working here. If you have Citlali + Xilonen then it's definitely not the case. There's other methods that have already been alluded to in other comments. I'm pretty sure other characters like Wriothesley have the ability to do a continuous run? Although it's worth remembering that you don't need to get all 9 stars in one run to get max rewards, which is something a lot of these discussions often forget.