It looks like they're going for "machine code" being directly putting numbers in memory, but if you know what you're doing that's pretty much just assembly in an obscure op-code dialect.

That looked like machine code on a 8-bit micro, perhaps the Commodore 64 or VIC-20 (based on the screenshot and 40x20 text). So that would be the 6502. Child’s play compared to what you’d need to do on a modern chip.

It's the machine language monitor on the 40-column screen of the Commodore 128 (or, more likely, an emulator of the same). I had a whole part about that, BASIC DATA statements full of numbers, and about how anyone with any sense actually used an assembler even back then in an original draft of my comment, but decided to keep it brief.