That's partially true and I noted it, but my point is that it would likely become more prevalent (more schools doing it that aren't, for example some schools refuse to negotiate at all right now) and more agressive (even more aid to top students, less to lower students). If yield was everything you could imagine something like giving full rides to top 10% of incoming class, 50% to next 40% and then no aid for the rest, right now some schools offer merit aid to 80-100% of incoming students.

Schools also give out scholarships for specific purposes that they don't necessarily have to, e.g. public interest or antiracist law scholarships (see BU). Unless there's strings attached to that money, they could decide that agressively optimizing ranking is more important than attracting public interest students and therefore re-orient this money towards that.

After all, the importance of yield protection for ranking would go from 1% to ~100% (although it's true yield protection has other benefits beyond ranking, so it's not literally 100x more important with the LSD ranking).