Not well researched (or edited?).
Quote:
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After 1980, no baseball set has had fewer than 10% grade out as PSA 10s.
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https://www.psacard.com/pop/baseball...-reserve/50958 Here is a set from 2001 Topps that has had 25,000 cards graded with only 44 PSA 10s, and the kicker is, that these cards were slabbed right after the cards were printed.
2001 Topps Reserve - [Base] - Graded Autographed Rookie #103 - Albert Pujols /1500 [PSA 8 NM‑MT]
Courtesy of COMC.com
Did they mean Topps flagship base sets? Maybe. That's not what they wrote.