Not unless they were expressed as such. You indicated that you predict Manchester United will win the Premiership, after your initial opinion. This made your remark a prediction or prognostication. 'I believe that the shop will have sold out of coke by the time I get there' is a statement of belief, not a prognostication at all, nor is it stated as a prediction of any possible future event. It is articulated as a belief, an opinion, a judgement, not a prediction.
But what if fully one-third of BILLO's predictions were actually predictions, that is, proved accurate??? What then BILLO????????