Not an expert but it does look like it to me. I have not yet found an aiptasia that is too big for a peppermint shrimp - they have managed to keep my tanks totally clear and one had quite a big aiptasia on some live rock...
I have a peppermint shrimp in my tank and I don't have any because of it. I have seen them too big for the shrimps to handle though but that one looks small enough.
Yeah I guess this is a YMMV situation. Mine only eat the ones that are barely large enough to see but wouldn't touch one that size. And my pepps are full-grown.