got a reply back from PSA. some interesting info.
"The information noting this set from 1908 came from the boxing catalog titled ‘Seconds Out – Round One’.
It looks like SGC and other industry sources get “1910” from the year that the T211 RED SUN baseball cards are believed to have been produced.
Should PSA decide to change the year for the T226 cards in the database, they will notify me and I will update the registry accordingly. I hope this information helps."