the thing about a centralised platform over praising its "end to end encryption" is that although no third party can snoop in on/intercept the messages mid transport..
.. telegram is the app maker. the app creates the keys so the telegram company can get the keys.
also they handle the handshaking procedure of the encryption set up.. so yes telegram can access your messages.. just not third parties intercepting message
Yup. End to end just means nobody can intercept it as it travels between the two, but encryption doesn't matter if you've got some sort of keylogger or spyware on your device. They're even commercially available these days with many parents buying them to "monitor" their child's phone usage, but even adults are now using them to nefariously spy on their partners.