You cannot even make it past the half-way mark of the OP to realize that the creator has no idea what they are talking about.

Something interesting I learnt about the generated gmail accounts is that they either contain + or an excessive amount of dots, 2 very odd patterns in real, legitimate email accounts. I was able to reliably detect at least 3 or 4 dots in the email itself when it's using the dotted variation.

Continuing the discussion, the fact that they are so defensive and immediately hide behind moral high ground when someone calls out their mental gymnastics out for the bullshit they are, makes me believe that they are a troll. A child would lose interest after getting so many negative responses.

The behavior you see from the creator is close to a troll tactic called "sealioning". While refusing to give their own claims any plausible proof (they constantly talk about "tests" they've run without any specification thereof), they request elucidation or sources for any contraindicating claims (here in the form of discussions which are held off-platform, e.g. on Discord), but fail to engage with any proof of the contrary (refusing to take protonmail and several other legitimate providers off the list even after talking to the literal CTO) while just reiterating their standpoint over and over again.

All the while, they pretend to discuss sincerely and are always polite and superficially receptive to counterclaims. This is key to their general strategy of eroding a victim's patience and exhaust their attention. One of two outcomes generally occur:

a) The victim snaps. In this case the troll will claim moral high ground and garner sympathy from 3rd-party observers because of fickle reasons like "there is no reason to insult somebody on the internet".

b) The victim leaves in order to not appear unreasonable. On a public platform, like a thread, many observers will then grant the "victory" to the troll because their stand point seems strong and counterclaims seem indefensible. This is the ultimate goal of the troll and what makes it dangerous.