You are correct that is a Luxfor model L45S, 153 bar tank - 2218.5 PSI service pressure, DOT rating 2216 PSI. It is essentially worthless for PCP gun use. Had it been marked
L45M it would be rated for 310 BAR / DOT rating 4500 PSI. Can you share the seller name either here or in a private message? I want to make sure I don't deal with them.
If it was not as described in the listing, ebay will refund your money whether the seller wants to do so or not. If the seller doesn't send you a return shipping label for the item that was not as described and give you a refund as soon as they have it back, contact ebay ASAP. Be sure to get a drop off scan of the return shipping label so you have proof that you sent it back. Also good idea to take a photo of the box at the UPS store / Post Office showing it as being sent. I would give them 24 hours to contact me with a no questions asked full refund where all you have to do is drop it off at the UPS store. Then I would go straight to ebay. You could even request a UPS / USPS pickup at your home or office, since it will take time / money to take their incorrectly described item to the shipping center.
I see that they are selling
another one that is also incorrectly described at a lower price. Still not worth the $80 they are asking. You should probably tell them it is also listed with wrong PSI rating. I wouldn't give even $15 for that tank.
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This seller has an Interspiro 45 minute 4500 psi tank hydro tested in 2019, built in 2014. They have sold some for $114 shipped and might accept an offer for that amount again.