https://www.iaa.ie/docs/default-sour...rsn=7aa90df3_6
3.IAA POLICY - Revalidation and Renewal of a Type, Class or IR Rating
3.2 Revalidation of Rating in a PART-FCL Licence.
The IAA intends to continue the policy outlined above for revalidation and, therefore, any Examiner Certified in accordance with PART-FCL is authorised by the IAA for the purpose of revalidating a Type, Class or Instrument rating in an IAA-issued PART-FCL Licence according to their Examiner privileges.
The way I read it any EASA FE can sign, but when it comes to FIs it's only for IAA licence holders.