Block-o-text is a bit tough to read - para breaks plz!
IMHO:
Yes, there are seeds / clones with original genetics
No, there's no guarantee that the seedbank you choose will have those genetics. Often they breed together a number of modern strains to achieve desired effects - in this case, "Old School"
Many are honest about it - just look for terms like, "Our take on", parentage or variations on the original name - GG#4 / GG / Gorilla Glue / Original Glue etc. are often used generically (as an example)
Humboldt Seed Co does this, but is pretty straight up about it, even showing lineage and F / BX and other details. Some of the description videos are pretty entertaining too. (I grew their OG Kush and really liked it.)
Our California Sour Diesel is a classic and is bred to grow and grow. It's helpful for relaxing and as an appetite stimulant.
humboldtseedcompany.com
I'm looking for Skunk #1; but I've come to the conclusion that it might not exist, and may never have truly been a "strain" as we know strains now.
The old hippy couple that I got mine from knew what they were doing - growing LOUD Skunk #1 - but there were always variations, and a lot of farmers actively bred to remove the smell to avoid detection - you could smell a large outdoor crop a LONG way off, especially if there was a NW wind (almost everyday...), so it made sense to breed out one of the things that could lead to a sentence.
It is confusing, and I'm no expert. IMHO, keep asking questions - but grow a skin - at some point you'll step on someone's shit-button and catch an eyeful, you might even spark another LED / HID controversy.