Because Flash is Agent Venom in the comics, so that's not a spoiler.

It's a pretty simple conclusion.

But I am curious if you heard this from someone who is plugged into the writing team at Sony or Marvel, or someone who is.

IMO, if they go with an MCU Venom who isn't an alternate version of Eddie Brock, I think the most logical choice Mac Gargan, Michael Mando's character from Homecoming, since he had a fairly significant run as Venom in the comics.

That would tie in with the long-rumored plans for a Thunderbolts film/series.

But if it's Flash, I just don't see it. I don't see that kid getting cast with an eye toward a future run as Venom.