Salaam alaykom as long as accordance with sayyid sistanis rules on talqeed you can either follow the wajib ihtiyat or go to another marja for it who meets the conditions of talqeed mentioned by sayyid sistani. Sayyid sistani has approved this option. As he has a obligatory precation (see minhaj saliheen) , so if you find ayatollah makareem shirazi as qaulfied enough accoridngly one may follow him in this ruling. But this is about the wetness from a non Muslim non kitabi.
However if you know they use najasaat in the cooking pots as example that is diffrent than considering their own wetness. Hence if you know something is najis you will treat it as najis.
Bur if you don't know if something is najis you judge it as pure.