Haven't been any posts yet saying it's wrong?
because it is.
The actual quotes in question:
Valve has been pursued over the years by Electronic Arts, which would very likely have valued Valve at well over $1 billion had the talks progressed that far
No offer was ever made. No valuation was ever made. This is simply speculation that it would have been well over 1 billion if it had happened.
Mr. Newell said that there was a better chance that Valve would “disintegrate,” its independent-minded workers scattering, than that it would ever be sold.