A correlation value of 0.8 is pretty conclusive evidence that the excess deaths are due to Covid.
So, what? I've told you before I don't deny COVID exists.
The occurrence of the large peak in April may be due to many causes, including collapse of the hospital system.
I don't understand the point you're making with this bit, sorry. Please could you explain? Hospital systems don't in general collapse spontaneously. But they can become overwhelmed, leading to lower quality care and more deaths, if they are hit by something like — for example — a huge influx of patients due to a pandemic.
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You can call it collapse being overwhelmed or whatever. How do you explain that there is a peak of 100% excess mortality just in April 2020 for a disease that has a so low death rate? That 100% excess was only in April. There is no other month with 100% excess mortality.