Is Mac Speed Up Pro legitimate to remove viruses?

If you're worried about malware, the only app recommended by most users here and by Apple Support folks themselves is Malwarebytes. Malwarebytes was developed by one of our own colleagues here in ASC and is about the most proven anti-malware software for Mac.

Do not install any third party app that claims to protect your computer from viruses.

Effective defenses against malware and ot… - Apple Community

If there were safe way to make your Mac faster, Apple would already have included it. Third-party Speeder-Uppers and Optimizers are also a scam.

If an app proclaims that it will protect your Mac from viruses it is not a legitimate app. As for the specific app you are asking about I do not have any knowledge about its legitimacy.