While the point about the different level of support of different repos is a good one and it does deserve more awareness, without the right context the claims of the article are easy to mis- or over-interpret.

I think a fair comparison would be to show other distros too rather than judge Ubuntu based on a single data-point.

For instance, a user stuck with ancient packages on CentOS may quickly reach out to alternative repos and pull in tons of packages with questionable security.