It's going to be selective to a degree because I don't have access (nor the will) to go through every game to show you consistent examples of Burnley playing on the front foot. This is the best I can do given limited highlights (goals). I don't think it's excessively selective though - as said, I've shown you a stretch of about 8 games, half of which Burnley scored as a result of a positive, forward thinking high press - certainly something most fans don't associate them with. Not sure how else I can demonstrate that the 'dinosaur' claim is false outside of this broad method.
Re: the excuses - I think it's unfair to say they didn't progress the playing style - lots of technical quality added into the side like Defour, Tarkowski, Westwood, Brownhill, McNeil (form fallen off a cliff for us but Burnley played to his very strong left foot).
The constraints above him should be taken into account though - they had zero cash and a board reluctant to sign off on foreign signings (because they saw them as riskier - ask your mates what they think of the Burnley board pre-takeover). Eventually that board was replaced by ALK Capital, which then allowed Dyche to bring in Cornet and Weghorst from abroad. In this context, I think he has demonstrated that he's a very good coach.