Honestly I don't doubt it's accidental, but the excuse he gave for the accident is so fucking SUS bro. I get that the phone in ur pocket can accidentally unlock and do weird random shit but...
His phone unlocked > Out of everything the phone could've done it opened twitter > Hit the RT button > Confirmed RT
No one with a public career would repost something like that, but I DO NOT believe that the accident happened because the phone was fidgeting in his pocket. It's just way too specific. The options to RT and confirm are so small too and it all just happened to touch the right places in his pocket...