As Chimaera posted above. Choice supported bias, or confirmation bias.
The remapping company know what they want to find, so they end up finding it with little hard evidence or circumstantial evidence.
Literally every single article I have seen on tuning boxes vs. remap thats by media or prospective buyers (with access to both) has proved that they do the exact same job, but the tuning box has the advantage of variable programming and easier removal.
This link is equivalent to what you've posted: https://www.racechip.co.uk/chip-tuning/remapping.html?gclid=CjwKCAiA2O39BRBjEiwApB2IkmGsGyW874Gh0J92NIf32OUrVEe0EJRqfNrlj9_7sjAH6MrUnkiE2hoCbq4QAvD_BwE
Of course the tuning box manufacturer is going to say theirs is best. Much like your remapping company is going to say a remap is better.