I have not listened to his DNC speach, but back in january he introduced a resolution that would have invoked the legal requirement that US assistance not be used to commit human rights violations. It failed 72-11.
Back in April, he spoke in the senate opposing the $8.9 billion offensive military aid to Israel; after having introduced amendments to cut those provisions out. (If you read 1 link from this post make it this one).
On October 25, he demanded information on how Israel was going to use the first aid package before it went to a vote in the senate, which was formally sent to Biden November 1.
At this point I stopped going through his press releases, because at this point, he just sounds like a Cassandra.
How is this anything other than PR? Biden has all the power to force a ceasefire. An arms embargo and threatening of sanctions would stop the genocide today.
Also since Bernie directly supports those folks you criticize why not ask him why he supports genocide or ask him specifically what actions he’s taking to stop it?