What probably matters to youSection of the release
What
The files argument now takes null entries to remove a file, and per-file live and reseed flags. Removals only work in a patch publish that names baseVersion; a first publish or one without a named base is refused with an explanation.
Details
index.html cannot be removed.
Duplicate paths in one publish are rejected.
The manifest-size error now counts files plus removals together.
Evidence
"index.html" is the page itself and can't be removed. Drop that entry.
Strings lifted out of the shipped bundle, so the claim above can be checked against them.