It's very odd I agree, the article is suggesting it is only suitable for lighter riders - maybe they are confused, or I have misconstrued the sentence.
No disrespect to anyone, but I wouldn't naturally think someone who is 110-117kg as a light rider, and I doubt they would either.
I've dropped CST an e-mail to enquire, I will post their reply when it arrives.
Reading the article it sounds like he's interpreting the 70kg max payload as TOTAL for both tyres (which would be crazy).
He says at one point he is 70kg so right on the limit - but if you then add the weight of his bike he'd be well over the limit if it was 70kg total (which I'm sure it isn't).
No one's going to release bike tyres with a combined max payload of 70kg - even Pogacar +UCI weight limit bike is more than that