I have been following powerwalls since 2019, and there wasnt any 2 powerwall minimum at any point from 2019 to now, so perhaps there was from 2018 to 2019. I do remember specifically a time when tesla would not sell powerwall installs without solar at all, starting sometime in late 2020 or so.
There is a pretty large difference in "When I installed my powerwalls in 2018 I remember they wouldnt install less than 2" and "Tesla wont install 1 powerwall, 2 minimum. One has a date qualifier and a time frame, and the other, with no other qualifications, is talking about "right now".