I think it was a DIY machine, those RTX 3090 have gotten cheaper for sure.
From my experience, going beyond 4 GPUs is a pricey affair. See [§]. All but one model of the RTX3090 require at least 3 slots.
If 4 GPUs connected via PCIe 4.0x16 are enough you can choose among various sRTX4 boards for 3000 series AMD Threadripper CPUs.
I have a dirty trick to ignore "bots" recruiters in Linkedin:
I just put a greek character on my name or add an emoticon, so I got a lot of messages starting with:
"Dear name ..
So, it's safe to ignore the message. Even when probably I'm not interested I used to reply with a template message, but I won't waste 30 seconds with a bot.
I can see very similar movements this robot is doing compared to my old robot. I really like the screen outputs of it.