Intel is using angstroms, so their "2nm" node is "20A" and the "1.8nm" node is "18A". These of course still don't have any more relationship with the physical size of the transistors than previous Intel, TSMC, or Samsung nodes but it keeps it relatively clean without needing a decimal point in the name.
Sounds like bullshit has replaced a once useful physical measurement. They should've found a new, real and objective measurement or just given up and used a date or arbitrary version scheme.
The shape and construction of the gates and transistors changed. Minimum feature size ceased to correlate with density/performance in some senses. This scheme has been somewhat arbitrary since about 20nm or so afaik, but expectations are set around what the number communicates, so here we are.