Whining noise when rev the engine

Hello everyone

I just bought a used 2019 4runner Sr5.
Yesterday i took it for a long ride (7 hr total). The car’s performance is very good.
But there is a whining noise (high pitch noise) when I rev the engine. It happens when rev it in park or uphill. No noise when driving in straight road doesn’t meter how fast. I have read on multiple thread that this is kind of common even with new cars. I just wanted to know if this is something serious. Every information is appreciated.

 

https://youtu.be/8uFtYM1NFNg

Sounds similar to this

 

Is that what an alternator sounds like? I have some of that whine, I think since new, but not as loud and not all the time.

Pretty sure alternators can get loud when they’re on the way out, but not sure if 4runner alternators are just more loud in general.