It looks like they're compressed sizes. If I gzip SMW.SMC, I get a 347 KB file. It's very misleading.
There are other issues in there. The writer makes it sound like MVG was the one who discovered that the pause in SFA2 was from loading audio data, when it was already known LONG before his video. https://forums.nesdev.org/viewtopic.php?p=70474#p70474
He also seems very confused about the RTC. It's obviously so that the clock keeps going even when the console is off and the cartridge is unplugged, like in the GBC/GBA Pokemon games, but he says something about how it might be because of the NTSC clock drifting? ??? What?
There are other issues in there. The writer makes it sound like MVG was the one who discovered that the pause in SFA2 was from loading audio data, when it was already known LONG before his video. https://forums.nesdev.org/viewtopic.php?p=70474#p70474
He also seems very confused about the RTC. It's obviously so that the clock keeps going even when the console is off and the cartridge is unplugged, like in the GBC/GBA Pokemon games, but he says something about how it might be because of the NTSC clock drifting? ??? What?