The article is super interesting and I agree that Telegram is really bad and as I said just a day ago I think, I have no idea why so many Bitcoin groups like meetup still insist on using it.

However, as I understand, the breached data are not coming from Telegram, they are exchanged by individuals within groups on Telegram and due to the poor security of Telegram some people manage to access they groups and the files exchanged on them.

Did I understood this correctly?