From what I understand, the Link buds (like the OG AirPods) are a loose enough fit that it’s basically the same effect as this. I don’t think the issue is fitting it in the ear as much as keeping it in the ear when running. Which would be why these are directed to runners.

Bose solved this but maybe is sitting on the patent — wingtips (“StayHere+”) that anchor the bud in the fleshy part of the ear. Their “soundsport” headphone used to be a loose ear bud style that used the wingtips, but now they only sell the wingtips in IEM models. I don’t think they win any audiophile awards, but those were spectacularly comfortable headphones. I bought them twice and managed to lose them twice (I have no idea how, I just don’t know where they are).