That is the standard sort of output; I find
/target/product/serranoltexx/e-1.15-r-20230920-CUSTOM_SLIM-serranoltexx.zip
/target/product/serranoltexx/lineage_serranoltexx-ota-eng.iain.zip
side by side, sorted by size, both 560 MB
For insight into the “weight” of apps try also ncdu prebuilts/prebuiltapks/.
Maybe some insight into permutations tried by others [FEATURE PROPOSAL] Split /e/ OS into separate components for core OS, Apps and UI changes, Cloud services
Ghost camera was found with bacon.