If @Rasenkai read the thread UP :
sda1 FAT32 Mount : /Boot/EFI Flag : boot, esp 550MB (550Mo is what The author of gdisk suggests which is 524,52Mio or 0,51Gio)
I do believe you could trust The Author of GDISK…and an EFI of 550Mo from 1Go HDD is not necessary to agree or disagree with just for few Mo !
Great to see that he did it finally, Welcome to EndeavourOS. 