Some workplaces explicitly test cultural closeness to their philosophy of work (language, architecture, etc).

It’s part trying to keep a common direction and part fear that dislike of their tech risks the hire not staying for long.

I don’t agree with this approach, don’t get me wrong, but I’ve seen it done and it might explain your experience.

No need to sugarcoat it. Some places are cults and it's best to avoid them. Good for GP.