He doesn't argue with increase and only argues what is source of this spike.
> The 2019 measurements are consistent with the trend over the past decade. Outliers (i.e. isolated data points that lie well above the average) are seen throughout the record. Do not over-interpret them.
He goes on to say there's no evidence this is from methane hydrates, or permafrost:
> That is not to say that we shouldn't worry about the potential for increased methane release from melting permafrost. But there is no evidence to support breathless claims that we have e.g. crossed some "tipping point" with regard to such processes.
The question is whether there has been a massive eruption of methane that is unprecedented, and could only come from methane hydrates.
Michael Mann says the "eruption" is consistent with past outliers and we shouldn't over-interpret the data. He says there is no evidence the increase is from permafrost, and that it appears likely to be from anthropogenic (i.e., non-tipping point) sources.
I'm not making an argument against climate change science. I'm making an argument against Dr. Peter Carter exaggerating climate science.