Agreed on both points. What’s generally considered more productive is isometric holds, as those both help the tendon AND have an analgesic effect. Most with tendinopathy in the Achilles can’t do 3x45 seconds isometric holds, but that is the gold standard for it. Instead, start with 15-20 seconds and build from there.
Those static loads will reduce pain and do much more good than ice can. There’s not really inflammation in tendinopathy, so at most ice just numbs things a bit. I question (unscientifically) if that’s useful for the 24-48 hours worth of elevated collagen synthesis one has after inducing load.
As to Platelet Rich Plasma, my understanding is that it hasn’t been shown to be helpful beyond anecdotes. To quote the luminary on tendons, Professor Jill Cook, “Why are we even discussing PRP, the evidence is clear that is does not work for tendinopathy” Stronger words than I may use, but food for thought.