All I ever saw was people claiming that someone else claimed it would be added for the keyboard UI. However, I asked about this when multi-select was first added for the controller UI, and as far as I know there were never any plans to add it to the keyboard UI.
Re: Still no multi-select for PC?
#657607 08/12/1903:54 PM08/12/1903:54 PM
No idea; there were either technical issues with adding it retroactively to the existing UI, or it would have required more time to implement than was feasible to devote to it. Multi-select was added for the controller UI because inventory management was much more cumbersome than with the keyboard UI.
Countering inaccurate statements is not being weaselly, especially when the claim being made is that it was promised.