The above isn't correctly distinguishing between the meanings of "trade" versus "profession". It's not a value judgment; the words simply have different meanings.

https://en.wikipedia.org/wiki/Tradesman

https://en.wikipedia.org/wiki/Profession

Doctors, lawyers, clergy, and (non-software) engineers are considered professions, requiring lengthy and wide-ranging education. The blogpost author is advocating much narrower vocational training in practical topics, which is characteristic of a trade.