Google says my device is “CPU iPhone OS 14_7 like Mac OS X”. Is that right?

That is just the way the browser identifies itself via its user Agent. There’s nothing wrong with that. Google is just showing you part of the user agent which identifies the iOS version. Apple itself adds the “Like Mac OS X” part to the user agent.

Mine shows up as: Mozilla/5.0 (iPad; CPU OS 14_7_1 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/14.1.2 Mobile/15E148 Safari/604.1

I’m using Safari on my iPad.

There is absolutely nothing wrong with that.

Lord knows how you are seeing that in Google, but my read of that is they are saying the operating system on the iPhone is iOS 14_7, and that is like MacOS X. Hard to say how that is being formatted, but that is my assessment of this.

Unless your device is jailbroken, then it cannot have malware installed. There is no way to have MacOS X installed on an iPhone.