No more disingenuous than claiming that removing a one-minute playback limit is the same thing as remote streaming and paying a fee for the former should exempt you from the latter.
The one-time fee was very specific in what it did. There is no longer a limit, but Plex have recognised the people that did previously pay the fee by providing a reduced price trial for the remote watch pass (which handily is, for all intents, the same price as the one-time fee). If they don’t stream remotely then great there’s nothing more they need to do. If they do stream remotely then they don’t end up any worse off than anyone else.