I would guess that being in a wheelchair would make him susceptible to clotting. If he got the mRNA or DNA vax(which we KNOW is associated with clotting) it could have been the combination which put him over the line.
Very sad to see such a inspirational, motivated person go down for any reason.
Or entirely separate from the politics he probably was a naturalist )except for the obvious steroid use for which there are lots of tell tail physical signs I observe in that photo) he died from massive, chronic steroid use.
I order and observe ultrasounds every day. In my now three years of observation of thousands of ultrasounds I can tell you we are not seeing increased “clots” and certainly not the massive clots funeral directors who wanted 15 minutes of fame which has long expired in LIVING physiology.