If it’s a headline, it’s coming from a press office, not researchers. The “why” is the same as for any other journalism: to get clicks.

> it’s coming from a press office, not researchers

fwiw, the pre-print reads:

   To define committed collapse, i.e. that past and unavoidable future emissions have already locked in collapse, we assume that global emissions cannot be mitigated from peak to net-zero any faster than 35 years.

    The ‘2025 peak ensemble’ therefore quantifies the probability that AMOC collapse is already committed, i.e. past emission have already locked in the collapse by 2025;