In answer to your question, it's impossible to say as it's all speculation. And even if it were occurring, you don't know on which horses that might be the case.
However in saying that, given the population based statistics around horses with blinkers on first time, his win rate and ROI for those horses is well outside the 'norm'. For the years 2013 through mid 2017, his blinkers on first time winners were very successful and returned a positive ROI on TOTE prices. Something he managed to achieve with more horses meeting that criteria than any other trainer. Yet from an ROI performance, his other horses returned 80 cents in the dollar.
I am not a behavioural scientist, but I refer to blinkers first time because as a layman, I felt benefits of such an approach would be greatest first time (since in that race, the horse will not actually experience the associated condition)
And of course, his stats if taken out of the overall stats, make blinkers on first time look even worse 'from the population'. Who knew?