What is an “actual target hardware platform”?

I don’t exactly know what you mean but here is the OS and CPU they use.

• Operating System: Linux 5.10 with Buildroot

• CPU: RockChip RV1106G3, Cortex A7 1.0GHz, H264 & H265 hardware encoder

Are you looking for the reference manual?

I was curious so I checked.

Aqua OS X logo is 2001-2007.

MS Vista - 7 Logo is 2006-2020.

Seems like you are correct it if the meme creator used the most recent logos at the time. So 17 or 18 years old.