Some Youtubers are very knowledgeable in the topic they talk about but some are not. In this case, he's talking about a cable for connecting balanced output to unbalanced input. If that's what you want to do, then this cable may work for you, but that's if the female RCA cable is what you need, otherwise you can get one that has male RCA.
The Monoprice I linked is for connecting unbalanced output, such the pre out of an AVR, to the balanced input of a power amp, and I thought that's what you want to do.
Benchmark sells both, one for each application, again the one I link is for RCA out to XLR in, the one linked below is for XLR out to RCA in, the difference is, in this case, pin 3 is left floating:
Due to high demand, please allow up to 2 weeks for delivery. CABLES ARE SOLD INDIVIDUALLY. Price is for one cable, Order 2 for a stereo pair. Benchmark Studio&Stage™ Analog XLR Cables Hand assembled in the USA with true silver solder Benchmark Studio&Stage™ Analog XLR Cables combine the best...
So, pick your choice accordingly.
For XLR out to RCA in, there is a whole ASR thread:
If I want to connect my DAC's XLR output to a preamp or integrated amp's RCA input, what are my options? This Emotiva adapter cable seems to do it "properly" https://emotiva.com/products/balanced-xlr-female-to-unbalanced-rca-female-adapter-interconnect but it'd be nice to have a cable wired...
For RCA out to XLR in:
I'm looking for suggestions for good quality RCA to XLR cables. I know these will by definition be unbalanced, but looking for ones that are wired correctly and use high quality connectors, such as from Neutrik. No snake oil :)
There are likely many more such threads to read if you are interested.