"The Host" is just another episode later ignored/retconned into oblivion. Like everyone's amazement at "theoretically possible" invisibility and much of what Spock said about 22nd century starship technology during his shipwide mission broadcast during "Balance of Terror" was wiped away by Enterprise
. Just like TOS' trips to the rim and centre of the galaxy can't have feasibly happend in the Voyager
Such is television. I know some of you will go "No, it actually all fits perfectly, you see... [insert incredibly conveluted explanations here]" but a retcon is a retcon.