Not much data in the post, just a customer's view who thought it seemed attractively priced at the time, but sharing for what it's worth...

That post mentions that it was trading at around 6 times earnings.
Their earnings vary a bit, so an occasional odd number isn't by itself a surprise:
2019-2022 earnings per share were $11.02, $5.19, $26.84, $17.91...definitely something for which a fancier metric is needed!

What surprised me more is that Value Line thinks that they'll [still] be trading at an average annual P/E of 6.5 in 3-5 years, despite earnings almost doubling from the current dip.
Since it's a longer term forecast, it is presumably based on the notion that earnings will be neither unusually high nor unusually low in that future stretch...so 6.5 is a very downbeat assumption for cyclically adjusted earnings.
Go figure.

I have no idea if the various forecasts hold water, and I certainly have no record of making money in the credit card business.
But the forecast seems to be for a business that will in fact do well but whose stock won't really rise in price.
That's just fine for a very long hold for someone like Berkshire. But annoying for mere mortals!
There is a 2.17% dividend to tide you over, I suppose.

Jim