In order to say that a significant number of these are drug and suicide deaths, you’d also have to be positing a theory that drug and suicide deaths are also for some reason elevating themselves in precise timing with the Covid surges. I’m not going to claim this is impossible, but it does seem extremely far fetched to me, and I suspect seeing the data laid out like I describe would probably make you abandon your theory. (Edit: using ‘your theory’ colloquially here. I know you havent posited any specific theory here, but your line of reasoning and skepticism is clear)
Edit to add: I actually don’t doubt that excess drug and suicide deaths are partially responsible for general elevated death numbers. Lockdowns, isolation, job losses, etc are all certainly driving some of this. But these are slow and steady drivers, not ones that rise and fall precisely with the number of Covid cases, which takes me to the conclusion that they are in the noise compared to Covid itself. (And the CDC death categorizations happen to agree with that)