Please note that the minimum specs for 4K (UHD - ultra-high definition) is higher than for HD (high definition) video, so your friend is advised to also take the video media to be used into account.
A modern but lower spec'd laptop will likely still be okay but there could be compromises with performance. But steer clear of an i3 processor IMO - it's an economy CPU fine for basic computer work like email, browsing, word processing; but more is needed for video editing.
Vegas Pro 20 is soon to be released. Whether or not it's minimum specs remain the same won't be known until its release.
I might get one after Intel 13th generation is launched later this year as I expect there will be some good sales.
For other specs I'd go 32GB ram or higher (esp. if it's soldered in) and 1 or 2TB SSD. For a 14 or 15 inch laptop I think HD or 1440p is high enough resolution (too high and text becomes small) and high refresh rates have no value for video editing so no need to pay more for that.