the author literally picked random projects from github tagged as matrix, without considering their prevalence or whether they are actually maintained etc.
if you actually look at % of impacted clients, it’s tiny.
meanwhile, it is very unclear that any sidechannel attack on a libolm based client is practical over the network (which is why we didn’t fix this years ago). After all, the limited primitives are commented on in the readme and https://github.com/matrix-org/olm/issues/3 since day 1.
Signal is not Fediverse! Element/Matrix is!
Don’t use Matrix the devs knew about sidechannel vulnerabilities and ignored them for years. This is peak negligence and should immediately disqualify you from touching anything security related.
From your link.