The bcm47xx legacy target continues to build device specific images for one device, which as discovered is a 4mb/16mb device: D-Link DWL-3150
I’m not sure if the bcm47xx/legacy images: standard-noloader-gz-squashfs or standard-squashfs are useful, but they at least are not being built to target a device that cannot run modern OpenWrt. It was not known to be a 4mb/16mb device when 23.05 & 24.10 branched and looks to have been kept out of an abundance of caution when the other bcm47xx/legacy device image builds were stopped.