Perhaps the actual products are good, but the credibility drops substantially as he has monetary incentive to list these things.
edit: It seems like the post author is acting in good faith
He's providing valuable knowledge, and sharing his extensive experience, during a time when it's beginning to be really rather quite important. Affiliate links are a perfectly acceptable norm and, frankly, don't disadvantage you in the slightest (in fact they give you an advantage in some cases: discounts, free months of services, and more.)
And as to the Workspace thing, it is super handy to have a immediately revertable system for any kind of demo so it’s controlled and you can reset if something goes wacky, and a Workspace (or Citrix or whatever) specifically is handy because it doesn’t eat CPU/RAM which streaming HD video typically wants a lot of.
Those tools too can capture individual screens, but then how do you do a PowerPoint presentation when you only have one monitor?
I'll be very surprised if I make any money from them anyway since the target audience (teachers and students) would get krisp for free, for example.
You can't satisfy all of the critics all of the time.