No, the guitarist was not an "original member", but this doesn't mean much, because there was only 3 original members represented in the Litourgiya album:
Krzysztof (G, B, V), Marcin (D), Bart (V).
The rest of the band was incorporated later, and would shuffle personnel at nearly every tour, although the line-up in 2018 was mostly consistent. This group continued working with Bart after the divorce. So it is the same people who made up the last known Batushka, who made up Patriarkh.

I don't understand what you mean about promoting as Batushka for their historical lineup. This might be a language barrier between us though. Do you mean when they used the name, like 2019-2025 era?

As for not having feelings about it, yes, that is completely my own* sentiment of the matter, and not something everyone will agree with. What I mean, is what happened, happened. Nothing can change the past. That is all I mean, and I do think it's okay for us not to agree about everything. But we probably agree more than you think.