And your point? CO2 was at 1950 ppm, and the temperature was only 3 deg Celsius hotter. Full stop. Period. That is a fact. Not a "factoid" ... a motherfucking fact.
So, from this one data point, we can fully conclude that having CO2 at 1950 ppm will *always* result in a planet that is 3C warmer than today? I think that the parent was making the point that a whole fuckton of variables have changed in and around the planet in the intervening 200 million years, so it is making an apples to oranges comparison.
Here, I'll give you an example of this reasoning. Last winter, while standing outside with my coat on, I was cold. Therefore, if I want to cool off on a hot summer day, I should go outside and put my coat on. After all, I had my coat on before and felt cold, which is a *fact*, a motherfucking fact.