If he knows enough about it to know it's an original pressing, then he's familiar with its provenance; and if he's familiar with its provenance, then he knows it's trivial to mention it's an original pressing, unless he has some motive other than being flippant for mentioning it.
A lot of people, including (and especially) hordes of eBay sellers, don't know the real story of this, the Huntsmen and Thee Wylde Maniacs. They think they're all from the sixties.
They don't frequent boards like this to learn about the records they hawk on the Bay. They just check things out on sites like Pipsike and Collector's Frenzy, which are filled with incorrect information about obscure (to the rest of the collecting world) records, when there even is any info aside from the selling price, which is what they primarily care about anyway.
How many non-knowledgeable sellers who use the results sites do you think actually look past the result listings for any records they "research"?
You can't project your own knowledge and familiarity onto others.
Especially clueless eBay sellers. Their interest is to sell a record, not become an expert on it. They don't understand all the nuances you describe.
It's unfortunate that the internet has opened the way for such people to step up and pass themselves off as record dealers, but that's the way of the times and we have to adapt. Which means it's more important for the buyer to be the one who has to be familiar, knowledgeable and alert, which is the case no matter what the seller is about.
In this instant, it's up to the buyer to know this isn't a 60s record and act accordingly. And believe it or not, there are people who know the truth about all three records and still want them anyway (though not at the price this seller is asking). In the end, it's all about the music.