"Downstream of" is doing a lot of work in that sentence. Language has an effect on, but in no way determines, the reliability of software written in it.
replyDownstream doesn't imply determinism.
replyThe original claim is one of determinism. Your use of the term "downstream" is hiding the distinction; it can be read in either way, so it bridges the gap between the position you want to defend ("using Zig causes a higher probability of memory bugs") and the position you're forced to defend ("using Zig results in extremely many memory bugs").
replyIn short, I'm accusing you of doing a motte-and-bailey.