I think, his point is, that the question makes little sense, and I tend to agree with that. The main reason is, that to even have a bankroll, you need to be a winning player. And most people asking about the required backroll for the lowest possible stakes, do not have any track record to prove, they are long term winners.
You are (hopefully) not going to quit your regular job to play $1/$2 live games, so it does not really matter that much, if you "go broke" and have to take some time off from poker. And even if you play 20 hours per week, it still takes a full year to play just 30.000
hands in live poker. Which mean, you wont even know, if you are a long term winner, until you have played at least a full year and perhaps even 2-3, if your winrate is marginal.
So it makes much more sense to ask, how large your savings should be, before you consider playing live poker. And I think, we can probably all agree, that if your total savings are only like $1.000, then you should probably just leave that money in your account rather than take it to a casino to play poker, where you could easily end up losing it all in a bad session or two.
But if you savings are $5.000, then maybe its ok to take $1.000 from that savings to a casino and play some live poker. Which still does not mean, that your $5.000 is a "poker bankroll", because you dont know, if you are a long term winner or not. Only when you have that track record and is considering to move up to higher stakes like $2/$5, does it make sense to think or talk about a dedicated poker bankroll.
Its the same thing with
online poker, where people sometimes ask, how large a bankroll they need to play 2NL. And the question is kind of silly, because if you can not afford to pop another $20 or $50 into your account after some losing sessions, then you should definitely try to fix your financial problems rather than spend time on playing poker.
So online as well as live it makes a lot more sense to ask, when you should attempt to move up, and how much bankroll you need for that. Which would be something like at least $100-150 to attempt to move up to 5NL online and at least $10k-15k to attempt to move up to $2/$5 live cash games. And of course being reasonably confident, you can beat the new higher limit, or at least want to give it a try.