Autoscaling is both simpler than this and more complex than this.

For predictive autoscaling, boring old-fashioned forecasting techniques appear to work fine and are very fast and very cheap.

For reactive autoscaling, boring old-fashioned control loops appear to work fine and are very fast and very cheap.

There's still no substitute for understanding your application's design.

If you tried to design and build a factory the way folks propose to rely on autoscalers and ML ("we'll ignore what's in the building and rely on a thin, unintelligible gas of floats!!"), you would be fired.