I believe that’s why one of the recommendations in the linked post is to turn off bindings. The camera and speedtest bindings are just the ones that triggered the error–they aren’t necessarily the root causes. It could be that one of them (or some other binding) is spiking your memory usage to 99% without failing.
FYI, I don’t think that post is actually specific to OH2. It’s just that people often referred to OH2 in the same way we now talk about OH3.
@wborn, do these old instructions you gave for a generating a heap dump still apply, or is there a newer method for Debian Buster?