1. Well, only if you consider "AV" to mean both audio and video have to be carried over the same wires. Otherwise, it's the first digital video format to my knowledge, but not the first lossless uncompressed video reproduction format. VGA and its relatives are also lossless and uncompressed, but analog over the cable. (Like vinyl.) LPCM audio (found on redbook audio CDs) is lossless and uncompressed. AES/EBU was standardized in 1992 to provide digital audio transfer between digital devices.
2. I have zero HDMI sources.