It seems to be the case, though: "Every account with an active subscription at the moment of the pricing change on March 15 will get the “Early adopter” status. This will make the special “Early Adopter Professional” plan available to them instead of the regular Professional plan, with the main difference being 1,000 free included searches monthly, instead of 700."
Ref. https://blog.kagi.com/update-kagi-search-pricing#existing