If I remember right, when the Atlantic Conveyor stopped,

there were no cars SUVs, aircraft, nor millions of buffalo or cattle farting into the atmosphere; it was from a truly, unimaginably huge glacial outburst flood that put all that cold fresh water into the North Atlantic in a very short time.

And unless someone is hiding such a lake and ice dam, I do think that the catastrophists are, once again, full of shit.
The new study claims to have shown that AMOC is “on route to tipping”, a prospect that the authors say is “bad news for the climate system and humanity”.

However British scientists warned that the outcome had been “forced” by using unlikely variables, such as assuming large influxes of freshwater into the Atlantic.

Prof Jonathan Bamber, director of the Bristol Glaciology Centre at Bristol University, said: “They did this by imposing a huge freshwater forcing to the North Atlantic that is entirely unrealistic for even the most extreme warming scenario over the next century.

“Their freshwater forcing applied to the North Atlantic is equivalent to six cm/year of sea level rise by the end of the experiment, which is more than seen during the collapse of the ice sheet that covered North America during the last glaciation.”