Falco's spotdodge is said good because he's one of the 5 characters that have a 22 frames long spotdodge (with invi frames being on 2-20 and other characters mostly having a 25 frames long spotdodge).
That means that if you buffer spotdodge into spotdodge into spotdodge etc. you only have 4 frames of vulnerability, which means that only lingering/fast multihit hit boxes can touch you
Now about your vid Jbrandew, I get understand why Drew said "dumb camping". There were 2 things that I felt was off in your camping :
-SHDLing when Snake was far away and crouching
-SHDLing when Snake was close enough to dash attack under your first laser.
The first one is bad because it doesn't change the status quo so there's no reason Snake would ever stop crouching, or even approach you. To make him approach you can ledge run double laser (since when well timed it hits a crouching Snake), approach and weave in and out of his "dash attack punition" zone while mixing your SHDLs with empty SHs or simply taunt.
The second is bad, well, because it gets you punished a good amount of times lol, like the first time in match 1 where you trade 21% for 3 %, not a good deal if you want my opinion.
Now on more general advices I'd say just practice on spacing your moves better (you master lasers well but everything else needs more experience) and be careful about your CQC zones. Like either stay in your grab range or at your maximum Ftilt range, but not in between. And don't ever approach Snake's Utilt range when you're at KO percent.
PS : tell False to Utilt you out of Dthrow, please.