Why on earth would the Supermium developer release a version of the browser purporting to be based on Chromium 132, but actually based on an earlier version?
That would make no sense at all if it can easily be checked, and he must be well aware that it can be.
Surely it's much more likely that the core is indeed Chromium 132 but one or more of the tweaks which have been made to it, especially for compatibility with earlier operating systems, have resulted in the mutually exclusive issues with Twitch and the British Gas site, which now cannot both work properly at the same time.