Its adjustments lead it to still claim that > 99% of India, Indonesia, Philippines are all in "extreme poverty", that > 90% of Thailand and China are, that 84% of Russia is and so on. Those are not remotely realistic figures.
I’m only familiar with Thailand if those countries, and $30/day is roughly $900/month, or 27000 baht per month in Thailand. That’s a pretty good income. I would bet the vast majority of people make less than that. Seems legit.
You're looking at the chart for "ordinary" poverty, which they've pegged at $30 equivalent per day. Their threshold for extreme poverty is $2.15/day.
I don’t know how they’re adjusting for cost of living, but that’s not even a good definition of “ordinary poverty.” As of 2011, Pew defined $10 PPP dollars as the middle income threshold. 10-15% of Bangladeshis have a car—but according to the chart, 99.5% are in poverty.