Yes and no. The initialism stood for Berkeley Packet Filter when the concept was first introduced in the early 90s. However in ~2013 BPF began to be extended redesigned, hence “extended BPF” (eBPF). Since then eBPF has drastically grown in functionality and subsumed BPF. Nowadays eBPF and BPF are used interchangeably but it is no longer an initialism. The BPF being discussed in the link is the “eBPF” kind. Discussions about the former design have settled “cBPF” for “classic Berkeley Packet Filter”.