I think this can be misunderstood in at least two ways.
My most understanding reading is that you mean Telegram receives the data in plain text at their servers.
That reading implies that they don't do this whole "encrypted data one way, keys another way" thing. (If we know they don't do that I am interested in knowing.)
But a number of people here on HN will read it as "Telegram sends data unencrypted", which is definitely incorrect.
