If you will try to develop this bot I think it would be best if you make it just some kind of channel on the Unofficial Bitcointalk Server promoted by
Cyrus, if you don't have personal knowledge I think working both with TryNinja and Cyrus would be a good idea. Also the Discord server is not doing well right now in terms of its member count where it only has 249 members in total and as of right now only 28 people online so maybe implementing more features for this server will help it boost up the member count and the number of active people.
Why do some people take the forum seriously? Tracking notifications through the Telegram bot is more than enough for a regular user. If there is an BTT Discord bot it will be considered an addiction to the forum.
I appreciate that you are trying to develop, but the most important step is to find enough demand, so ask the community if they want to get that bot before starting to deloping it.
I don't think people are doing it for the purposes of being "serious" in the forum but for them to help out other people who are interested in this kinds of things. His idea isn't that bad or is something that will affect Bitcointalk in a bad way so its really not a good thing to discourage what he wants to do especially if no one has applied it yet. Also if someone has developed a notification bot for Discord I don't think someone will be addicted to the forum because of it, I wake up everyday looking at my phone with dozens of notifications from various apps but after skimming all of it I basically hit "clear them all" in my phone.