They obviously don´t mention that selling point anymore, but this could
theoretically imply that a lot of funds from dubious sources (e.g. ransomware proceeds)
could have ended up in the Tether reserves.
I'm not 100% sure if that screenshot is saying that they used to sell USDT for Bitcoins or that they were just pointing out you could use an exchange to get them.
What do you mean by 'in the Tether reserves'? Surely all USD they hold in bank accounts must have been deposited as USD. If you mean people having Tether wallets or holding Tether on exchanges isn't that then like arguing that the Federal Reserve is at fault if funds from dubious sources are held in $100 bills?
Edit: I think I've worked out why they took that off the website. Now Bitfinex requires verification to be able to withdraw USDT. Did they not require it before?
And before you say it @TheQuin, I know that this is conjecture on my part and
could very well turn out to be wrong. But I think it should be allowed to voice different
opinions in a public discussion forum.
I've got no problem with conjecture and differing opinions. It's usually the way these things are presented that I disagree most with.
They must have these money in bank accounts.

You finally got something right. As we have discussed many times before, an NYC accountancy firm verified this fact only a few months ago. Most companies are only audited annually and it would be rather odd if they were required to do it all the time just because some anonymous bloggers are publishing false allegations about them.