> The "worst" RCP8.5 / SSP5-8.5-style futures (coal-dominated, ~4.4–4.9 °C) are no longer treated as plausible

That's a strange way of structuring such a comment. The temperature increase and concomitant catastrophes are still on the table, what was considered the plausible worst-case scenario with regard to how early that particular milestone might be reached has (apparently) been pushed back.