What they talk about is Rosetta's macOS frameworks compiled for Intel being kept around (which macOS Intel apps use, like if you run some old <xxx>.app that's not available for Apple Silicon).
The low-level Rosetta as a translation layer (which is what containers use) will be kept, and they will even keep it for Intel games, as they say in the OP.
You might've tried it during an arms race moment. YT is constantly changing it's anti-blocking measures, and uBO and uBO Lite are constantly responding. uBO had the same issue.
uBO Lite does lack custom filters and custom filter lists. It also doesn't have sync, but uBO didn't do sync well anyway. Also sync is far less useful without custom filters.