Just a note on the grammar of this: "HN runs on top of SBCL since a few months".
"since a few months" sounds wrong, it isn't idiomatic english. Consider replacing it with:
"HN has been running on top of SBCL for a few months now."
"since a few months" sounds wrong, it isn't idiomatic english. Consider replacing it with:
"HN has been running on top of SBCL for a few months now."
Rewriting it to "since a few months ago" seems to be the easiest way to fix this, though my favorite way to express the the same thing is "as of a few months ago".
It should be noted that the author, like most people you're likely to interact with in this bubble, is not a native speaker of English. What matters is getting the message across - which they did.
You'll end up not being very productive if you spend your time pointing all of these little slips out.
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[1] See what I did there? Eh? Eh?
English, where that construction sounds weird and at least needs some helpers around it to exist, is a bit of an odd one out. It is kind of odd that we can say "for three months" to say that something took three months, but we can't say "since three months" to refer to something that has been going on as of three months ago.