"High quality" and VWEAX are not in the same Venn Diagram--although they do strive to get the higher rated issuances within the junk bond market:
Vanguard High-Yield Corporate Fund invests in a diversified portfolio of medium- and lower-quality corporate bonds, often referred to as “junk bonds.” Created in 1978, this fund seeks to purchase what the advisor considers higher-rated junk bonds. This approach aims to capture consistent income and minimize defaults and principal loss. Although this is a bond fund, high-yield bonds tend to have volatility similar to that of the stock market. This fund may be considered complementary to an already diversified portfolio.
Not my cup of tea for a bond investment, but I suppose it can make sense within the "already diversified portfolio."