Untrue. RECI had the ETCI change this from Normative to Informative, and indeed RECI encourage the use of ring circuits in kitchens. (Utility rooms are not mentioned either - the advice in the Informative appendix only relates to kitchens.)They’re not allowed in Irish kitchen / utility circuits for example, for that reason.
Also the sockets are not classified as BS1363 but IS411 (and IS401 plugs).