Yeah . Sounds like horseshit to me to be frank.
I have a udm se, 10 g3 cams, 4k bullet+ai, door entry + cam +ai, couple of the display viewports running all day and a nano hd access point and symmetric gig with intrusion etc turned on. I also have wireguard users connecting in remotely.
No problems with performance whatsoever at this point.
Ok its not enterprisy its just a small business with 20 people but seems fine to me. I run synology servers.