Yes, it would seem so.
I guess it is primarily the case because a lot of people from web development background find the underlying stack (based on modern web technologies) very appealing. The community contributions by the team behind Hashnode have also focussed on web technologies which makes sense given that primary product is a web based offering and the open source components are extracted out of it.
Secondly most of the AMAs done by the team have been with important web technology professionals. So it is natural that as a platform it has gained popularity among their followers.
It would also seem that, that focus has helped towards a homogenous feed with very few unrelated/non-interesting posts for early participants. As the community grows and naturally diversifies and more content is funnelled in it would make sense to have algorithmic prioritization based on interests.