McKenzie states it as fact and even names teams that can no longer be trade partners because of the cap inflation. He was carrying on this theme for weeks. This is just brutal journalism if all he said is false. Unforgivable levels of incompetence.
Ask yourself what would be the purpose of this so-called cap inflation that supposedly only screws over teams. There's no reason for that to exist, which tells you right there that this is wrong information.
As has been said 50 times in this thread, cap hit is calculated DAILY. A 10M cap hit for 3 months is equivalent to a 5M cap hit for 6 months. Nylander's daily cap hit was higher because he signed later in the season, but his cap hit was ZERO for the two months he sat out, so the Leafs were just banking that cap space in the meantime.
It would only be a problem if the Leafs spent to the cap while Nylander was holding out instead of banking the salary, then dumped salary to sign him. It would also be a problem if they tried to trade him to a team that had been up against the cap all year.
The Leafs have a small issue in that Horton's contract will waste some of the cap until Marner signs (as well as Dermott and Hyman's replacement while they're out), but Horton's cap hit is a lot less than what Marner will get so they should be able to maneuver around that.
This really isn't rocket science, it's just common sense.