Whoever said Prof is still reliable, that's absolutely false.
First of all it depends if SA or Dorito are in the starting lineup.
Second, it's an RNG fest that decides if you have a chance, starting with how many assists you get, which ship gets stunned, do you lose a ship, when SA is in starting lineup Mark gets often called in first therefor not instakilling one of your ships etc.
The Videos I saw are mostly against SA and the ones with Dorito are either 7 star Levis but not fully maxed out Pilots or ships it seems because some abilities are impossible to be used in that order/before the opponent if their ships are maxed/ pilots have 6 dot mods etc... or just pure RNG luck that does seldom happen.
So yes, you can still use Prof but it's far from reliable, especially if the opponent has the right mods, Relics and Dorito in the starting lineup. I really hate that some people talk about it as if it were an absolutely reliable counter and no big deal, which is not true and I will continue to point it out, because the second most expensive fleet in the game got devalued and I don't think that's ok.
And before someone gets any ideas, yes I have Leviathan.