These (any article about “you can build X with an rPi” ) articles serve no other purpose other than run it in that no one who isn’t an enormous OEM or scalper will get anywhere close to being able to buy an rPi for any price that makes sense to do any of these projects for at least the remainder of the year.
No shade on the rPi guys, they’re doing all they can, this is broader supply chain and process node availability issue, etc, but the actual cost of any rPi project these days (esp one that uses multiple) vastly outstrips any viabikity of it in economic terms even for hobby purposes.
The BOM to build this bc of the rPis alone is a probably 2x what a solid compute blade would be new and an incredible one used would be.
I think a healthier, more useful message and write ups could be “here’s projects we were going write up with an rPi but you can do without an rPi until they become available”.