They are not a real administrator but people who joined moderator bounty, increasing their activity by answering peoples' questions. I think there will be an official statement from the team after they are finishing the bounty, it seems like right now the team is focused on increasing their Telegram channel activity. Let's just wait for it until it finishes, I highly doubt we will get our answer at this rate.
Yep, that's absolutely right, but I personally and maybe also some other member really hope from the main development team to at least say hello at telegram, I think taking a few minutes in a day or in a week is not a big deal
i honestly do love it when members of the dev team took some time out to converse with the telegram community from time to time, it spikes a new level of confidence in the project(though not a guarantee of any sort), personally, this is one of the things i look out for whenever i join a telegram group of any project, it shows the team are also part of the community, not all the talking is left in the hands of some admins.