I think your opinion is strongly founded on a bunch of personal assumptions given how little information was provided. Be careful not to miss the point by fixating on details.

I’ve seen a lot of bad engineers and most of them undervalue helping others. Good engineering leads know that they can write more code by supporting everyone than by writing code themselves. Definitely a form of mentorship. I’ve seen some that are almost 100% mentors.

A good work environment will see only good from developers asking each other questions to gain a better understanding of the complex systems being worked on. I was pretty senior in one of my last few roles, and I regularly asked questions of the folks that had been building the system before me. And I always made time to support other devs (and QA and support folks) that came to ask me questions, be it about code I wrote, general questions about technical things or whatever. Being supportive to each other is what made it a really fun place to work at.