The word "admits" is always a red flag. It's meant to suggest that somebody has been forced to reveal something they were hiding.

The IPCC never said otherwise about the worst-case scenarios. They've always focused on the best case scenario: SSP1-1.9. That's where the oft-touted "1.5C" number comes from.

They rarely mention the worst case scenario (SSP-5). And that's not an apocalyptic scenario. It's just very, very, very bad -- about 4C of warming by the end of the century.

They don't even try to consider the really disastrous scenarios. They don't need to, because the certain scenarios are bad enough. It's deceitful to say otherwise.

It's implausible now because coal is no longer the cheapest source of energy, and that changes things quite considerably. Glad to see climate change deniers accept that reality.