The SZBOX S513 is a flat computer system with a powerful and still up-to-date Intel processor, which should be well suited to a number of purposes. The choice of connections, however, does not seem very advantageous.https://www.notebookcheck.net/SZBOX-S513-Flat-PC-with-Intel-processor-and-dubious-choice-of-connections.786936.0.html
Le dubious VGA connector is probably because it's a repurposed industrial PC, where VGA is more commonly used. That also explains the blocked off COM ports.
If you're fine with 1 display or connecting an extra VGA display at 1080p, then it's good.
I find this less dubious than other mini PCs because it actually has two SMA ports for antennas. Anything without an SMA port is dubious to me. The writer is dubious.
VGA is still quite common in classroom projectors and corporate presentation boards too.