You’re mostly correct but there’s truth to the original statement. Back in the PlayStation/N64 through to PS3/Xbox 360, consoles were so different to each other and PCs that porting games was a major task that resulted in very different outcomes.

Since the PS4/Xbox One, they’ve been similar enough in underlying architecture that engines like Unreal have been able to smooth over the differences enough to make multiplatform technically viable. It’s meant companies like Capcom with RE Engine have made a huge success out of selling across all platforms, including PC. That freedom for publishers is a problem for console manufacturers who have fewer 3rd party exclusives as a result.