What you quoted was sarcasm... Microsoft is claiming that Windows 10 would be so much more secure than Windows 7/8, and he's saying that if Windows 10 would be

What you quoted was sarcasm... Microsoft is claiming that Windows 10 would be so much more secure than Windows 7/8, and he's saying that if Windows 10 would be much more secure, then it shouldn't be suffering from largely the same bugs and vulnerabilities. So, Microsoft's claims are quite obviously bullshit.