I don't interpret this article the same way. Ehlers denying he asked for 20 minutes does not mean he has not been frustrated with his utilization over the years. The message I get is that he has been, but has been advised to be discreet about it and be a good teammate while he is still a Jet.
Below is another pp from the Athletic article, which tells a different story.
Ehlers’ average ice time has increased from 14:43 through five games to 15:59 after 11 games played, which is the seventh-highest out of Ehlers’ 10 seasons to date. He’s rewarded them for that increase with a hat trick against Columbus and yet another elite points-per-minute rate. The biggest drop in Ehlers’ minutes has occurred at five-on-five, where he’s played the second-fewest minutes of his career. He’s eighth among 12 regularly used Jets forwards, which helps cancel out his increase in power-play time.
There are many teams in the NHL that would play him 18+ minutes a night, and with his elite PPM scoring and possession game, pay him commensurately. Heading into UFA, he and his advisors know that full well.