The Dead Ahead summary does sound similar to some of what happened in Fear the Walking Dead’s second season, but there’s no saying at this point if the show really did take anything from the comic as alleged by Mel Smith.
A portion of Fear the Walking Dead Season 2 took place on the ocean, with the survivors taking refuge on Strand’s yacht, the Abigail.
They run into danger from another group on the high seas, and everybody is running short on supplies while zombies continue to overrun to mainland.
There is the point that pretty much any project set in the zombie apocalypse is going to have similarities to other projects; only those familiar with the show, the series, and the people who worked on them can currently know for sure.