I think the Eric Roche clip has 'slapped harmonics' created by striking the guitar with the underside of the finger on a node point rather than tapping as in the first clip but what the heck.

Here's another technique that you could either consider 'flashy' and showing off or - as I do - a masterful guitarist/musician beautifully executing a difficult technique to enhance the music.

Tommy Emmanuel - Somewhere Over the Rainbow - if you haven't seen this I think it's a beautiful piece of playing