Currently less than 1% of the population in many industrialized countries are working in agriculture. That is laughably few people and there is no reason why it couldn't be a greater share of the population. Guess what: many people are actually enjoying this kind of work when it isn't presented in a context of total exploitation.

And no, while agriculture certainly tends to be physically demanding, it is not unreasonably so, even when done at small scale and with smaller machines. Small scale agriculture has been mechanized to a large degree and mechanized solutions have even been developed for very sustainable approaches to agriculture like agroforestry and syntropic agriculture.

I would have expected comments about AI and robotics instead. If you can build terraces and farm them robotically, then you can reuse the technology on Mars.