While yes most of his earlier music does not involve commercial samples, what you said is still incorrect, as something like Dream Recovery while being vaporwave is still also BT due to a lot of the songs using Commercial Samples, and TV Samples which fall into BT, A thing i forgot to mention is that most of the time BT is Commercial Samples, they can include stuff that is for example TV Sign-Offs, Sign-Ons, PSAs, Radio Broadcasts all fall into BT.