Something is missing there. I cannot believe AENA and ENAV are so ignorant of EU regulations. Both Countries are in the EU and therefore Community licensing rules apply. A controller licence for Milano or Roma , will not be validated , let alone recieve an instructor rating for say Madrid, without proper OJT first. Who will do this OJT and how long will it take . In "normal conditions " I would say a year. In the present situation ? definitively not less. So perhaps someone in AENA is thinking they can just issue stamp licences with "instructor" on somebody not validated with Xmumer of hours and tests on the relevant ACC ? Cannot beleive this.
Something fishy here.