The premise of this article is that you somehow have to respond to it which is nuts. If the letter is ridiculous (e.g. citing terms of service you did not sign) then you're better off to ignore it and not waste money on legal fees. Also everyone who suggests getting a lawyer has probably not had to hire one in the past. With very few exceptions they will tell you it "depends" and maybe give you a few legal terms you…
If you have not received a C&D before then the reason to consult with an attorney is to evaluate the risk. A lot of legal trouble arises from assuming you understand something when you actually don't. (Ask me how I know.)
The poster you are responding to just explained that most lawyers are too guarded to offer a useful evaluation of the risk, thus rendering their advice useless or low value.