I really don't see how it would've helped. In go or Rust you'd just get a panic, which is in no way different.

The article mentions that this Lua-based proxy is the old generation one, which is going to be replaced by the Rust based one (FL2) and that didn't fail on this scenario.

So, if anything, their efforts towards a typed language were justified. They just didn't manage to migrate everything in time before this incident - which is ironically a good thing since this incident was cause mostly by a rushed change in response to an actively exploited vulnerability.