My head is hurting from reading and re-reading section 4 of AWS D1.1, can someone please help?

I have a manufacturer that has what appears to be an approved PQR for welding ASTM A514. The PQR is for 3/8" thick plate using a single v-groove weld, butt joint. Does this PQR and subsequent WPS qualify this manufacturer to weld ASTM A514 plates thicker than 3/4" utilizing single or double v-groove welds?

I don't think that it does, but my head is spinning after trying to consider all of the little foot notes included in the tables for section 4!

Thanks in advance for any help you can provide.