-
shoulder press is a shoulder press
A little personal anecdote. I've developed a rotator cuff problem in recent years. Weirdly shoulder press didn't hurt it. Turns out that I had adapted my form slightly to compensate and it was excruciating to do correct form. I compounded the problem by doing this.
I'm not exactly inexperienced with lifting weights. I used to teach Olympic lifts when I was a PT (20 years ago now). I'm very out of date and have forgotten a lot (not to mention that opinions have changed) but I know the basics and importance of form.
I have found it extremely useful to be micromanaged on form every now and again to help me get back on track. A shoulder press can quickly stop being a shoulder press if you're not careful.
The coach might want to check your tekkers if you've been working at home. But to deload you that much seems excessive. I'd have thought : "ok. You say you can do X, let's see you doing what we left you at, then quickly go up until I spot a problem, stay at that and then go up again".
IANAGB