For those who don't know what iLovePDF is, it basically allows you to convert a literal equal copy of PDF into docx or a format more suited towards editing on LibreOffice/OpenOffice and some other things related to PDF, rarely losing some visual formatting when it does its usually related to the font but its not so often
I assume you ask where in the Git mention the Flathub link since Flathub deems it unverified? It's on On Linux section of the ReadMe