Well… The original meme is in kbps (kilobits per second or kilobaud). The quoted speeds for the tech seem to line up with kbps and not kB/s, so I think this is the intent.
8 bits = 1 byte, so in this specific example it was very easy to convert 8 kbps to 1 kB/s to determine that it would take 8 seconds to download an 8 kB file.
Maybe secret300 meant a 8 kilobit file, they did use lowercase ‘b’ afterall 🙂.
That was an alternate history where he was successful and celebrated.