There's no uploading involved if that is what you mean.
But you connect to a public server and when issuing a download command there, it will usually be logged in the chat log in some way.
So, the server has your IP address, the XDCC bot which sends you the actual file has your IP address, your IP address usually gets (publicly) logged in the chat when connecting to the server/room and sometimes even the file transfers get logged publicly.
It's not a very private system, but AFAIK nobody has ever gotten in any trouble for downloading from IRC.
I still have a Windows 10 gaming machine that gets fired up occasionally to be honest. Originally it was a VM on my Linux system, but I had some issues with cache latency and anti-cheat, so I'd figured I need a dedicated system. Nowadays I game as much as possible on my Steam Deck, though. But I think in a year or two I will switch that Windows system over to Linux as well. Gaming on Linux has gotten that good.
Honestly your best bet is probably to use a game with a built-in benchmark over Steam. That way you get numbers that are somewhat comparable to the ones from public sources (game review sites/videos).
I don't know why there isn't a proper tool like 3DMark for Linux systems.
It's not really enabled right now, but my offsite backup is a combination of a Raspberry Pi 4B, a QNAP TL-D800C and a Tasmota WiFi power plug at a family member's place.
I SSH in to the always-on Pi over a VPN connection, send a command to the Tasmota to turn on the QNAP disk shelf, do a zfs send and once it finishes it shuts down the disk shelf again.
I'm using ckb-next for my Corsair peripherals. Every other component in my Linux system either doesn't have RGB or has RGB intentionally disabled in the UEFI.
There's no uploading involved if that is what you mean.
But you connect to a public server and when issuing a download command there, it will usually be logged in the chat log in some way.
So, the server has your IP address, the XDCC bot which sends you the actual file has your IP address, your IP address usually gets (publicly) logged in the chat when connecting to the server/room and sometimes even the file transfers get logged publicly.
It's not a very private system, but AFAIK nobody has ever gotten in any trouble for downloading from IRC.