I have that same rice cooker. Zojirushi. It’s pretty solid, so I’d bet whatever fancy crap it uses to tell if it’s properly cooked probably helped the way his stuff turned out
You know it’s a premium rice cooker when the alarm sound is a music jingle. My microwave wishes it were that sophisticated.
Had to replace the microwave recently after the last one crapped out. This new one also has a jingle. Why does every machine need a jingle now? The dryer has a jingle. It’s not even that fancy.
Specifically choose our microwave because it can be muted. No unnecessary beeping or jingle is so much better.
Most microwaves can be silenced. I figured out how to shut mine up but several hours later my roommate unmuted it, I guess some people like the obnoxious noises.
How to Silence a Microwave: Quick Tricks to Stop Beeping

Microwaves tend to beep a lot—every time you press a button on the keypad, when the cook cycle is complete, and then every few minutes afterward to remind you if you haven't taken your food out yet. Are all these beeps a bit much for you?...

wikiHow
Are these all Japanese products? I find that the Japanese love a little jingle for some reason
i mean, i can distinguish between the different beeps on the different machines but maybe giving different machines different jingles helps people who can’t
You know it’s premium because it costs hundreds of dollars instead of $20…