I've seen this info too, but it's the only one. chrono-shop got obviously a bunch of NOS/sealed 93150 and 93250 bracelets with EB+month (at least seen 1, 8 and 10), but they're loose parts - so there's no link to a watch with known serial range or a sale date info. As far as I can see no EB clasp appears on the net before 2015, and here I've found a proof that an EB10 got sold by Rolex Japan in 2017:
(BTW, the link doesn't work on my smartphone but on PC)
Indeed the clasp code is not mentioned on the Rolex paper, but I don't doubt in the seller's statement, no reason for wrong information.
In regard to this sale I can't believe in older leftover parts anymore, too much demand. So because of these two indications (no appearance before 2015, Rolex sale in 2017) I assume these are reissued vintage style bracelets from around 2015. Just as a first shot. Or it's a leftover anyway, but likely from an edition after 2010.
At least this code exists on genuine parts.