To directly quote, "Yet what should we think of the morality of following the principles behind land acknowledgements

"The principles behind" instead of "the implications of". It's saying the practice is implicitly (mis)grounded in a moral framework that leads to bad conclusions, not that it's explicitly calling for ethnic cleansing or might as well be.

My read is that the interviewee

It's not an interview.

there is proposing that blood-quantum requirements are not where it's at

That's why I said "downplay" instead of "support" or "agree with".

material conditions there at this point make reasonably-peaceful resolution like in South Africa or Ireland seem infeasible

Yeah. The thing I try to keep in mind to fend off despair is how often things seem infeasible until they're not.