That sounds very similar to hiding behind sneaky talk in order to keep the practical effects in the background.
Almost no-one cares about the terms "Manifest v2 extensions" - because almost no one recognizes them for what they really are. Most people can understand it by its effect - that it will disable UBO. Only sneaky people will insist on using the technically correct, but obscure term in a PUBLIC announcement - clearly the aim is to make sure that the public overlooks the announcement.
Almost no-one cares about the terms "Manifest v2 extensions" - because almost no one recognizes them for what they really are. Most people can understand it by its effect - that it will disable UBO. Only sneaky people will insist on using the technically correct, but obscure term in a PUBLIC announcement - clearly the aim is to make sure that the public overlooks the announcement.