How actual is `cvt` utility now?

With a simple input like this:

cvt 1920 1080 60

or

cvt -r 1920 1080 60

it gives two modes with pixelclocks of 173 MHz and 138.5 MHz, respectively.

However, CEA-861 states that 1920×1080@60Hz mode should have a pixelclock of 148.5 MHz. My fullhd monitor happens to have been receiving exactly this frequency, as it shows in its on-screen menus.

Why is there such discrepancy and can the output of cvt be trusted at all, for any other modes such as 1920×1200@60 or 2560×1600@120 ?