Narcissists insert themselves - meddle - to make themselves great again.

without giving Donald Trump full credit for it.

Obviously this was created by someone with more tech skills than are needed to post deranged screeds on a phone while sitting on the toilet, but that someone either wanted to curry favor or was commissioned to produce it on Trump's orders: "Make a thing where I'm winning the hockey game and I get to punch a Canadian."

The center of all the world’s attention must at all times be laser focused on him.
The bride at every wedding. The corpse at every funeral. The turd in every punch bowl.
The shame of every American.

Trump succeeds again at making himself look ridiculous.

"own the libs", "own the Canadians" etc. It may also act as a recruiting tool for future bigots to enter the Trump regime (eg the human scum said to be the new replacement DHS spokesturd) - if they repost this kind of crap, and defend it publicly, they're the kind of immoral, suck-up, xenophobic sociopaths that Trump needs surrounding him.

I cannot imagine a similar fake being made with any other President, though almost all were more athletic. Beyond that, Trump himself posted it!

I doubt Trump even played intermural ice hockey in college. At this point, I imagine he barely has the balance to walk quickly much less run.