I'm not sure where you found that, but the text doesn't match what the actual Champ website states if you go directly to their website. The wording is under the "Champ" heading, and does NOT say "All Champ filters", it says "Champ filters" - the reason that is significant is because below that the XL line has a separate description. Not sure if I'm just not finding what you linked or what?
Products - Champ Filtration
champfiltration.com
My eyeball is showing "All" in the text below.