Having achilles tendinopathy means you need to load the tendon, which is what the help drops are for. The reason for using static heel holds and heel drops is because you’re loading the tendon isometrically (not moving) or eccentrically (muscle lengthening) is because it allows the tendon to be loaded without applying compression and this reduces the chance of making it sore.
Once you’re passed this initial phase you then move on to exercises that shorten calf muscles. Throughout it is best to make sure you are doing any f the exercises you want to do as many with a bent knee as with a straight one so you are specifically loading the soleus. Same with calf strengthening and stretching, you need to do some of it with a bent knee to target the soleus.