They closed your longtail item and actually notified you!
That must be a new policy.
My books are often up for years before selling, and I constantly get the 16 month warning.
I just pull them down and relist them a bit later, a week or a month, with changes if I see anything that needs it.
When we retired and moved in 2014, I found that of the 1000+ books in my stockroom, only about 650 were actually still listed.
And eBay refuses to admit that they will take down long unsold listings or, for that matter, relist unique Sold items.
I now review my listings a couple of times a year, just to be sure what's there really is in stock.
And I put my Active listings into alpha-numeric order about once a month, to check for duplicated listings.
The probable reason, to my mind, is that eBay can't close down for a few days to clean up all the glitches and errors, all the old systems that are no longer used (like DSRs) but impact other still used coding, and just the sheer ancient programming complicated by having some 50 sites with 50 different sets of laws to deal with.
