One of the reason that I rationalized in my head to buy an eMTB was so I wouldn't buy another motorcycle.
Because I know being a senior citizen I am going to break some bones and chip more teeth with a motorcycle.
I think you are right at the door for weight limit, but I would do it. You will love it.... you'll still get a lot of exercise and you will enjoy it more.
That Giant Fathom e+3 looks good. Has Yamaha motor... I like those motors. If you could go up in price a bit and get one with Rockshok fork, it would be better. Everything else looks good.