Uh... Certainly not.

Just rewatched the whole show and saw this one recently. It's an OK drama but not great Sci-Fi. There's not really any good SciFi in Lost because it didn't have good plot/action/story writers. JJ Abrams gave it everything interesting in 5 minutes and then they bombed it completely.

Unstuck in time randomly, unsure of reality, connecting to a person briefly somehow stops death? How did someone figure that out? Why do the next people with this affliction not become unstuck in time? They're left to fade away, unable to find "a constant" to save them?

In the same plot, why do 2 people flash back and forth in their own timeline while other people time travel? Why do X amount of those travel time while X amount of their compatriots aren't afflicted? (Sun, who arrived at the same time, is left out of the party.)

Why does the unstuck time disease affect 2 random people that leave the island at that moment & then stop? Why does the same disease hit the other cast that are actively time-traveling but remain on the island? When it's explained what's causing them to jump (stuck wheel) is fixed the "time disease" was not even happening when Desmond & (George?) got sick in the first place.

Like all of Lost, they haphazardly wrote whatever artificial drama they wanted in order to tell character stories. Specifically, many times they could connect random cast together over and over in the past/present/future for no reason except to evoke a sense of wonder that consistently meant absolutely nothing. They were so intent on creating a sense of intrigue they forgot to create the payoff of significance. Definitely bad/hack Sci-Fi.

I don't even think that's the best SciFi episode of Lost. That''s probably somewhere near the start when they're figuring out the island is mystical. Between the French signal that never ends, smoke monsters ripping up terrain, dead people prancing around, whispers and healing. A great launch & even more powerful fizzle.