If a virus has been manipulated is beyond my paygrade, I don't have the knowledge (or even the interest for that matter) to figure this out. I suspect that's the case for a vast majority of people here or elsewhere, so be a little careful of what a "fact" is.
I don't know if that guy is truthful or not, but always keep in mind that people are just people, regardless of their scientific backgrounds, and they are prone to bias or hidden agendas.
These being said, if what you quoted is true I already have a big question mark:
Covid-19 virus has elements of HIV and Malaria germs
Malaria is a eukaryote, quite different than a virus, I have serious doubts it would play any advantage into an RNA virus (it that is even possible).
Either way, my rule of thumb for these scenarios is to go with a consensus of reputable scientists vs one that has a conspiracy theory.
PS. one more thing, absence of evidence is not evidence of absence.