@Joanna,
Odds are that there is probably some truth in what you're saying.
With that said, just about everyone has an "agenda" or simply an interest in something. Promoting that something, whatever it may be, is acceptable as long as it is done within reason. My guess/impression is that he is probably more interested in promoting leetcode than Pascal (I could be wrong about that) but, so far, IMO, he hasn't crossed any lines.
I'll remind you that, when you first appeared in this forum, you were "promoting" IRC and, to the opinion of some, mine included, a bit too "vigorously".
The point, give people a chance to make their case. If they become too "enthusiastic", it's quite likely the moderator will rein them in. IOW, to an extent that is reasonable, give the benefit of the doubt.