'Thousands' is very committed. I wonder if they are doing this to make a statement, or if they feel rapidly scaling up to a thousands strong prototype test fleet is the most effective way to accelerate progress towards market ready L4 robotaxis.
As the analogy goes, just because it takes 1 woman 9 months to make a baby does not mean 9 woman working together can make a baby in 1 month.
Either way, it's very committed. GM isn't fucking around, they mean business!