Hi DenDen and welcome!!!
the HDMI to USBC is almost definitely for output from the computer (usbc->hdmi->tv)
the RGB (fingers crossed it’s actually component) converter will convert rgb to hdmi - but you’d still need to get it into something (computer) to record - so probably need a video interface
I’d check with Lars re what they are recommending these days - I’m not sure that the Intensity Shuttle TB is still in favour!!
As stated above you would need to process the RGB out to be either component or composite in order to record/display (visual cortex or the cadet module combo will do this)
another option, which a lot of people, me included, use, is to rescan the output (ie film the tv screen) personally I’m using an iPhone as the camera - filming a lcd tv screen - arguably better results can be obtained with a DSLR and a CRT tv