I would consider it extremely obscure overall. A large majority of programmers would not be aware of its existence. At the same time there are clearly much less popular languages with articles so it is kindof weird to push to delete. (eg: random scheme implementation w/ no releases in 20 years https://en.wikipedia.org/wiki/SISC) I would say that wikipedia broadly favors programming languages as far as notability. Like most nerd/geek things their footprint skews toward the internet, and people who enjoy geek stuff are more likely to be wikipedia admins than the general population.
SISC is there because it's not notable, so the busybodies haven't even noticed the page exists. Odin, however, is notable, and that put it on their radar as a target for attacking its notability.
This is an argument for deleting those non-notable articles as well, not retaining other non-notable articles.