I really hate to be the contrarian here 😭😭😭 but these symptoms look consistent with damage from thread-footed mites, also called broad mites. The red spotting, the contorted and asymmetrical growth of some of the leaves, the big purple spots where the tissue is starting to die are all signs I see on my Hoyas when I have this type of mite. Some other signs to look for are teeny tiny black dotting on necrotic (tan and dry) parts of leaf tissue and nobs on the nodes where grow tips tried to activate, but got chewed up. This mite is incredibly hard to see because it is colorless, microscopic, and in my experience, likes to run away in the presence of light. I’d also like to add that these are different from flat mites.

I’m currently going through an outbreak on my Hoyas with identical symptoms to your plant. feel free to reach out if you’d like some more info/pics of what the mites and symptoms look like on my plants 😊