M1 Mac x86_64 app building: Is this Rosetta 2?

I've just figured out how to use the architecture change in terminal from:

https://vineethbharadwaj.medium.com/m1-mac-switching-terminal-between-x86-64-and-arm64-e45f324184d9

I'm using MacOS on M1.

env /usr/bin/arch -x86_64 /bin/zsh --login

makes me an environment in terminal to be able to build my application for x86_64 MacOS.

My question would be: is this made possible by Rosetta2? And will be here until only 2027 Fall?

Because if this is Rosetta, I see a justification for Rosetta to stay more around until people still use x86_64 Mac Operating Systems to be able to build apps for them on Apple Silicon Macs.