What the source says
Lander Martínez Hierro appears in the 2023 elected-members workbook.
The source associates this elected result with Bizkaia and the candidature label SUMAR (SUMAR).
Lander Martínez Hierro is named as elected for Bizkaia in Spain's official 2023 Congress elected-result workbook under SUMAR. This is a historical result record, not a current-tenure claim.
The source associates this elected result with Bizkaia and the candidature label SUMAR (SUMAR).