For two account to use same Telegram ID shows that they are connected and neutral tags can be given to both account and again it is also a merits abuse by sharing merits across both account that is being controlled by one single user. For cheating in one bounty the manager have all possible right to remove them from the campaign since is already in the campaign rules.
When in the past there was evidence that the two accounts connected to the Telegram ID apparently joined the same bounty campaign, it does not rule out the possibility that a negative tag would be more appropriate than a neutral tag. I'm sure some people are still collecting evidence. even though Merit transactions and proof of blockchain transactions have been published here.
regarding accounts caught joining the same campaign. the manager has made a good decision by disqualifying them immediately. Even though the bounty manager doesn't tag them personally, these accounts are definitely on the manager's blacklist.