No, I don’t actually agree with the point made. But a pet theory can indeed be described as both a wondering and an assertion. “I maintain” implies lack of proof, but only a conclusion drawn from inconclusive evidence.
And it certainly isn’t anti-Semitic or bigoted.
Nope. I maintain means there is more than an opinion, it implies an opinion based on measurable data.
The fact is that there is NO data to imply that there is a connection between the two dialects.
If you read the initial assertion, and do not sense an edge of bigotry, that is, opinion based on ill feelings and no facts, then we’re done here.