TLDR, the developers of pfSense are not the nicest people sometimes. If this bothers you, consider checking out OPNsense.
So first the author is arguing around on the router section that you should not buy a cheap router but then goes for pfsense instead of opnsense, i understand that when you are used to pfsense that you may not want to switch but recommending it for new ppl is just stupid. They have shown their hostality against their OS community in the past see https://news.ycombinator.com/item?id=13615896
And it is heavily opinionated, without pointing out other solutions like for example the use of openvpn without mentioning wireguard even once.