I thought that may be the caseUnlike the CX5 where you had a tpms switch that you could do some junior jiggerry pokery with to disable the system it appears they have removed the switch and any easy way for owners to disable the system within the MX30. TPMS does not show in settings as a configurable function as you are probably aware. It appears the only way is buy Mazda tpms sensors and register them on your winter tyres. Not having tried it I believe there are some "OEM" ones on the markets but they do need the right codes.
Alan
Mazda MX-30 (20-27) TPMS Tyre Pressure Sensors - SET OF 4 - BLACK STEM - PRE-CODED - Ready to Fit
Mazda MX-30 (20-27) TPMS Tyre Pressure Sensors - SET OF 4 - BLACK STEM - PRE-CODED - Ready to Fitwww.ukpartsdirect.com