I do not believe that Sabato is a pollster, but rather aggregates and analyzes the data from various polls.
Without question he is a Democrat, but that does not mean his findings are unsound.
As for the data he is using now, it only projects who would win the election if it were held today and has little to do with what will happen in November.
I have a feeling certain world events will happen in the next few months that will vindicate Trump.