The closing section of that article, “unnamed crypto lawyer” agrees with the knots side. Every other section admits it’s a low risk attack vector, but they all admit it’s a risk.

The knots side of the argument is acknowledging the risk, and deciding its not a risk they want to take. At this point I think both core and knots proponents understand you can chop up, compress, encrypt, encode etc data and get it onto the blockchain as it is.

It’s not a technical competency thing, it’s a conservative vs progressive view point.