The fact that this letter was leaked - unlike alleged similar communiques prior this year - screams that Israeli leadership doesn’t intend to comply, or wants to reinsert “leaving Israel defenseless ” into the US media cycle.
Biden proved with the JLOTS pier and aid airdrops that he wouldn’t couple significant aid distribution with continued weapons deliveries, and instead ran ineffectual workarounds to “be seen doing something”. Remember that 500 trucks a day was the purported minimum required aid in the spring/summer.
This activity unfortunately has a long history in the occupied territories.