Because "First Strike" is a piece of marketing blather, not meaningful...
For that particular company, "First Strike" means the coin was delivered into their grubby little hands within 30 days of the coin being initially issued. How that translates to strike order, I've never figured out.
For many special finishes, all of the coins are struck over a few days and they are then delivered to collectors from that population. Again strike order is meaningless to the label.
Finally, suppose the coins really are struck over many days... would you rather the first coin struck from fresh new dies on day 45? Or the last coin struck from old dies on day 44?
Yep, it's just marketing blather, but you pay extra for the label.
-----Burton
50+ year / Life / Emeritus
ANA member (joined 12/1/1973)
Life member: Numismatics International, CONECA
Member: TNA, FtWCC, NETCC, EveryCountry (online) coin club
Owned by three cats and a wife of 40+ years (joined 1983)
Author: 3rd Edition of the Sample Slabs book,
https://www.sampleslabs.info/