this seems to be what could make this a possibility.

it'll take some work but the video highlights this strongly: falcon is light-weight & with modest throttling. it's gonna land, and just barely drop velocity, wherever it was pointed. there's so much thrust to weight & not enough fine throttling that running the engines for a bit isn't gonna help let it position itself.

ss & sh are heavy as heck. as much as throttle-ability my gut feel is that it's really the mass that helps make hoveribility-positioning sensible. some ability to get to the area & correct, & then land. there's enough mass that a bunch of burning isn't going to immediately blast the craft away again.

that's what I got from the video, at least.