Because that's not how it works.
The 'click' stat tracks when someone clicks on your gig through Fiverr's search. Spamming your gig on social media obviously isn't going to affect that, since it's a different site.
It's old advice that was originally intended to stop people from relying entirely on Fiverr to spoon-feed them orders, but is now constantly being misused by "professionals" to claim that it'll fix all your problems.
Spoiler Alert: It won't.
I mean.. Really? The person you're taking advice from is allegedly a "Mentor" here, but if you take two seconds to look further they joined the site 7 days ago! They've yet to make a single sale, and all they post is nonsense. Take for example, their own woes about the exact same issue you have..
"I'm constantly marketing my gigs but I haven't received any orders yet" -rashed_50
Or how about...
"even after being online 24 hours a day and constantly marketing giveaways, the gig impression is very low and the key leak is very bad" -rashed_50
Begs the question, why are they giving the same advice that they claim is not working for them? It's just bizarre.