An independent priest with close ties to the SSPX died recently. His funeral was at an SSPX chapel. The bishop of the diocese attended the funeral and received Communion. How does that work?
I have not heard anything about a specific case in which a diocesan bishop received Communion at an SSPX Mass, so I cannot comment on this particular report. In answer to the general question of whether a Catholic can attend an SSPX funeral and receive Communion at the funeral Mass, please see the Q&A linked below.