It took 3/4 of forever for the article to get to its supposed point, but here is the simple answer to the title question. The City of LA - which is well over 100 miles from the Mexican border - is paying for the wall around the veterans facility, which the City of LA operates. Border wall, besides being over 100 miles away from LA and in a different county, is Federal jurisdiction and funding for it is coming from the Federal government.
I guess the Canada Free Press doesn't know much about the hierarchy of governmental jurisdictions in the US or about California geography, eh?