All I have seen is what is given in #121. KentOnline is the digital arm of the Kent Messenger media group, not wonderful but not prone to invention (although the date for closure - 16 June - is unlikely to be correct). I would be surprised if it doesn't have some basis in fact. The MP, who had heard the rumours, which apparently started about a couple of weeks ago, wrote to Arriva and does not appear to have had a response. Given that passengers, the council and other operators will have to make decisions, depending on the company confirming or denying the rumours, I would have thought there was some urgency. Most of all there will be a number of employees and their families who will be affected by the uncertainty.Has it been confirmed that Sheerness is closing? I have seen lots of different posts on social media and various forums but nothing concrete about Sheerness. I believe Sheerness operates the 334,347,349,360,361 and 367.
Your list is correct with the exception of a couple of school routes. I gather the 334 is be retained (and run from Maidstone), the 347, 349 are not listed as being given up and could be operated from Maidstone or Gillingham (pros and cons given in previous posts).