Maybe? In his first start the Stuff+ on fangraphs had it as a 124 offering, with all offerings above 123 for a total Stuff+ rating of 127. The location was very poor though.
TJStats gave his fastball a 115 tjStuff+ in start #1, overall stuff+ a 110, both better than any previous year. In start #2 thus far, the fastball had a 113 rating and the overall stuff 111. The whiff rate was horrible on it though, only 1 in 32 swings against. The swings and misses came on the cutter (slider?) and splitter.
Two starts might be around enough pitches to be able to make some conclusions relative to previous years, although I don't know if there's a factor of keeping up that stuff as the season progresses to really make proper conclusions on if he's gotten better overall.