I think only the Bitcoin signed address will be the only usable recovery means and should be enough if everything else checks out. Ethereum addresses and telegram accounts may not matter much to the recovery team.
ETH signed addresses are just as good. Might as well be
NEM Coin ... but it's always nice if it is from a very old post. Not the first one after a
3 year post gap.
Any chance you found the keys for that old BTC address ?
1Njf7sfLpUibFj3kGVc74fhHPrXzfrjf1G