If your supplier is using PAL, you need to assume the product does in fact contain soy. For reasoning, I'll refer you to a very tragic case still wending its way through the court systems:
https://allergenbure...allergy-death/
In essence, a manufacturer of coconut yogurt disregarded the PAL on one of their ingredients, which stated 'may contain milk'. They did not carry the PAL over to their packaging, and they did not have a particularly robust process in place for checking the ingredient for traces of milk. Eventually, a batch of yogurt went to market with enough milk in it to cause fatal anaphylaxis for a customer.
It's not to say you must avoid this ingredient at all costs — but you must assume there is a risk of soy contamination in the product and take the appropriate steps. Or find a different supplier.