Just out: Marc van der Poel et al. (eds), The Oxford Handbook of Quintilian. The chapter on Quintilian in Late Antiquity by Catherine Schneider mentions Sidonius in par. 16.2 (Carm. 2.191, 9.315-17, Ep. 5.10).

Another recent publication marginally related to Sidonius is Francesco Montone, ‘Lo scrittore Ennodio (474-521) in viaggio sulle Alpi: l’Itinerarium Brigantionis Castelli‘, Salternum 46-47, 2021, 35-59 (passages from the carmina and Ep. 1.5 in particular).