Earlier quoted context omitted.
“Tat” means miscellaneous junk. That said, the anecdote is made up or important details have been elided to make it sound more interesting than it is. Amazon doesn’t depend on whatsapp for 2fa. You can configure amazon 2fa to send an SMS and it’s possible that the poster’s mother has misconfigured her phone to claim that it needs whatsapp to read the sms 2fa message but I highly doubt even that. When I look on amazon…
How does "tat" differ from "grot"?
Grot I've never heard of in terms of buying stuff. Grot to me just implies something dirty