You can see what is going on by changing the sentence slightly, but using a more polite noun.
- That nonsense is typically liberal.
Here the adverb ‘typically’ modifies the adjective ‘liberal’.
- That liberal nonsense is typical.
Here the adjective ‘liberal’ qualifies the noun ‘nonsense’, while ‘typical’ plays the role performed by ‘liberal’ in 1.
Using a hyphen, the difference is between calling whatever had been said typically-liberal nonsense and calling it typical liberal-nonsense: not very much. Both are correct grammar.
But are you sure the one word “typical” was a correction? It could have been an exclamatory use of the adjective to apply to the whole thing, in effect repeating himself.
Typically liberal nonsense. Typical!!