The ARMEL and MIPS64EL architectures have been dropped from Debian unstable and experimental. This is the end of the road for these aging ARM and MIPS targets in the Debian world.
The ARM EABI “armel” for older ARM 32-bit devices and MIPS 64-bit “mips64el” targets have been fading away for a while with declining relevance and lack of hardware availability and waning developer interest too. For ARMEL the most notable hardware is the Raspberry Pi 1 and Raspberry Pi Zero (W) boards but besides that not too much activity these days from those running ARMEL and actively upgrading to new (Debian) Linux OS releases. The MIPS architecture has been fading into obscurity for a while.
But riscv is growing and armel is shrinking so presumably there’s not enough interest from contributors to sustain support.