I believe that the related tags have been renamed to blocked-tags and family.
Requests to block a tag can be done through the use of the tag-block-request tag, and the FAQ on the subject has been renamed to use the "block" terminology.
I ventured over to Meta Stack Overflow, and the related tags appear to be blocklist-request and tag-blocklist. So I suppose the naming scheme varies per site.
As you mentioned, a rather large amount of work would be required to clean up all mentions of tag blacklist and family, but the blacklist tags have been synonymized with the "block" terminology tags by an SE employee, with the exception of one last remaining blacklist tag. So, at least that part is (mostly) taken care of.
The timing of those synonymizations (is that a word?) appears to line up with Yaakov Ellis's post on SE's stance on the terminology, which mentions...
In that vein, we would like to announce that we have made the following changes on all user-facing portions of the sites:
- We can confirm that no instances of master/slave are shown in the UI
- All instances of “blacklist” have been converted to “blocklist”
- All instances of “whitelist” have been converted to “allowlist”
So... blocklist it is! It appears that this ("blocked tags" and "tag blocklist") is the official term to be used moving forward.