Thanks for mentioning this issue! I believe this has already been fixed in the latest nightly build v0.3.0-1.
The fix is not yet on the general release build yet (v0.2.9) but should come eventually when v0.3.0 is near completion. As a temporary measure, you can block the user and the corresponding comments should be gone!
So that’s what it was! I saw several comments followed by a mod child comment stating “Removed for XYZ reason”, but both parent and child commments were still there.