The late XV105
Yes, the Tupolev canards were a novel feature, but I understand they were only necessary in the first place because of lower speed control issues as a result of more basic aerodynamics.
Dunno about the source of your info on this but it may have got a bit garbled in the telling.
With a plain slender delta on the approach the trailing edge control surfaces will be slightly up and as speed is reduced this angle will increase slightly. If you want to raise the nose in the flare then even more stick back will be needed. This gives - if you like - a wing with a negative flap angle and so rather less lift needing a higher speed than you miught wish.
If you add some canards to give a big nose up force then to trim the aircraft the trailing edge surfaces will all be down a bit - giving a flapped delta with considerable benefit in terms of reduced approach speed.
The Tu144 with canards was able to land on the display runway at Le Bourget and take the second turn off right to the aircraft park - a quite remarkable demonstration of its modest speed on finals.