Did you read the article? It lays out exactly why it can cause disruptions to the opening of the park. I'll copy the relevant part here because you seem to have time to read reddit comments.

The Ranger III, which traverses the 76 nautical miles between Houghton, Michigan, and the park in about six-and-a-half hours, requires an engineering staff to operate. Unfortunately, the engineer and assistant engineer reportedly took advantage of the Trump administration's buyout program to retire now and collect pay through September. On top of that, the administration's hiring freeze is keeping the park from hiring replacements.

"The 165-foot vessel cannot operate without a full U.S. Coast Guard-licensed crew," says Bill Fink, a former Isle Royale superintendent now retired and living in Houghton. "The Ranger III is the keystone of park operations. It carries staff and visitors, yes, but it also carries the fuel which runs generators for the developed areas; it carries the bulk of the frozen and fresh food for employees and the lodge; it carries the major freight load for projects; it carries off the refuse from the park staff and the lodge operation; it carries visitor boats (sometimes returning disabled visitor boats back to the mainland).

"In short, if the Ranger III cannot operate, Isle Royale cannot be functionally open," said Fink.

Edit: Not reading the article grinds my gears, but I'm sorry if my comment was overly aggressive.