It doesn't say liquid assets though, it mentions multiple options which vary in how easily you can/should use one to pay an unexpected bill or period of unemployment.
For example, if one is using their life-insurance payouts to pay their rent... well, something has gone very wrong somewhere.
Specifically, this part:
> financial asset—which includes transaction accounts, certificates of deposit, savings bonds, other bonds, stocks, pooled investment funds, retirement accounts, cash value life insurance, and other managed assets
For the highly-liquid "transaction accounts" (checking, savings, money-market) the conditional [0] median is just $8k.
[0] AFAICT "conditional" here means "we don't include $0 data points in the median." That explains why the subcategory of "stocks" has a higher conditional median value than the more-general category of financial assets.