To be honest whats the advantage of having experenced multi crew pilots teaching Single pilots ops.
But that aside PTC do appear to be a bunch of gob ****es and have zero issues with telling out right lies in thier marketing, hence the reason they got found against for truthfullness by the British ASA.
As for the four bars milarky sorry thats pish There are loads of schools out there that the instructors wear just smart casual style uniform with no bars on show. The bars are to give an image to the prospective customer if the school has a good reputation and isn't struggling to get customers in they don't need to bother with all that bollocks.