This was all blatantly intentional. Respawn purposely is shoving the clues in our face that Forge is NOT dead.
1) the first official image we got, Forge is shown with a bent right arm showing huge scars on his forearm
2) The interview with "Forge" right before he is killed emphasizes his forearm and the fact he is observing his medal/charm. His shirt sleeve is ROLLED UP to clearly show his unscarred forearm!! There's no other reason they would be showing us these parts of his image if they weren't hinting at the fact it's NOT FORGE.
3) The scar on his eyebrow; again, another huge clue in our faces the whole time. The interview Forge has a huge scar on his brow. Our official, real Forge has no scarred brow. Another clue this is a fake .
4) Lastly, the description for the charm gives the final obvious clue to us. He is "often imitated".
Why would Respawn bother to say this in his death box charm, after he's supposedly dead? Surely that's really unnecessary? Well it's not. Because they're clearly telling us, he's alive. And this was not the real Forge that was killed.
I'm still not giving up on the narrative, we have a week before the season starts and plenty, plenty of time for more trailers and the truth to come out. If this was the real scenario, they would've dropped this towards the end of the week, not at the beginning.
Source: https://www.reddit.com/r/apexlegends/comments/euw2vd/imitation_forge/