Old fashioned and archaic? You realize this subject is centuries old and there is nothing new? It is important to study the original texts to get the real "kernel" of the subject before practice (lacking an accomplished Guru). It is the "modern" authors who are responsible for muddying the waters of this subject since most of them have half-baked knowledge and then market their "experience" (a lot of which is frankly fad/hyperbole/BS) to the gullible. Other than a few scholars like James Mallinson, David Gordon White, i wouldn't trust anybody else's translations/interpretations/websites.

PS: I took a look at the AYP website. It is junk and i wouldn't trust it. When the author is advertised as "Yogani, is an American spiritual scientist" and equates "Tantra == Sex" it is nothing but a marketing scam. Stay away and read the original texts and form your own interpretation.