To me, they all - including the dog - look too healthy to have been stranded for 5 months. I would think there would be muscle atrophy for starters.
Then there is the “story” of them having a year’s worth of food on board (explaining why they weren’t starving).
What, you never saw Gilligan's Island? Passengers on that ill-fated voyage brought along years worth of personal belongings, including enough clothes to be able to wear something different every day! That is, all except Gilligan, the skipper, and perhaps the professor, who wore the same set of clothing every single day for the duration. But at least the professor was wise enough to take along a complete library of his science books. And the Howells, a pirate's chest of cash money. And that was only supposed to be a THREE HOUR CRUISE!
I don’t believe them either, but, when we cut the lines and head out, we plan on taking 8 to 12 months worth of food with us (our boat has LOTS of storage) and have a water maker so we can have water.
We’re not planning on being at sea for that long without touching land, but, prices food food in other countries do tend to be higher than here.
We’ll also have e-prbs, sat phone (and maybe internet), and an SSB radio. And we know how to sail.