It would be nice to clarify the difference between a "Removed" comment and a "Deleted" one.
Resources:
https://we.phorge.it/rP58f66fea804ede7c3827895458c62f1604e0c776
...
AFAIK, a "Removed" comment is in a logical state where it should not display its value to end-users. A "Deleted" comment has also lost its storage. But, I do not understand what the storage is, for a comment.
Anyway, if this is true, the related Diff should be correct now.
D25095: Removed Comments: add CSS class "phui-timeline-shell-removed"