Graphical glitches and issues

Hey everyone, I have attached some images from one of my players on my server.

He ran into graphical issues when trying to play rust, I was wondering if anyone here has run into the same issues and what you did to appease it.

Some things to note; he is using a Mac computer so my first assumption is that maybe this is the problem since Rust is not optimized for OSX (To my knowledge?)
however at the same time I do have friends who play Rust using Macs themselves. I am also going to send a shoutout to Facepunch to see if they have any solutions but I figured I would check here too.

Thanks ahead of time.