The article mentions the hash is required to begin with a certain number of 0s in hex digits (half byte) whereas the Bitcoin whitepaper refers to it as number o

The article mentions the hash is required to begin with a certain number of 0s in hex digits (half byte) whereas the Bitcoin whitepaper refers to it as number of bits. I'm unsure about the comparison (== or >) but the whitepaper seems accurate with regards to the target.