That example isn't really LRT, it's either commuter rail or an airport train, which (either way) only stops once during that 13-km trip. LRT normally involves much closer stops.
LRT linking to commuter rail lines, subway lines, and bus stops is something the author didn't really mention, but it certainly seems to be the strategy for that line in Toronto.
The author is against cutting funding for bus routes, which is reasonable. I guess I just don't see how that is also an argument against using LRT for arterial transportation into downtown cores. If the retort to that is "budgets", then we need increased funding for public transportation, not fewer trains.