What are you talking about? They are discussing about the application's real-time execution. Which one is lagging and which one is faster? I think it has nothing to do with the "Trust" thingy. and besides, the official site also endorses and confirms that the game can be accessed through Telegram so it does not make any difference if one access the game through Telegram or through the site, but the performance.
I understand what he meant cause some folks really have trust issues with anything related with telegram due to several scam related activities on that platform but then he should reconsider his statement cause atleast, they made an alternative for people to access their site and if it works perfectly when accessed through telegram then their's no big deal or any need to worry since the performance of the site is what matters regardless of where it's being accessed from.
I am also very careful about telegram because scammers like operating there. But if you don't join several channels and groups, you won't be inviting scammers to yourself.
Speaking about telegram betting of Otherworld. It is not a new thing, you can actually play on telegram for many casinos. It is not a difficult task and doesn't require much set up
All you need do is to follow their direct link from the website or this thread and sign up with them on telegram and you are all set.