Why do you think this is lying? This is just not saying revealing everything all at once, it's just reserving some of yourself for later. Remember this is just advice for the first date
. There are some things you can say and do on the date, and there are some things that are just too much for it up front. That anon was only telling you things from the latter category. You can play the rest of your hand over time.
Just for example: saying you despise your mother because she's a drunken wreck of an addict might be too much for the first date. Saying you love your mother would be a lie. Saying nothing on the topic of your mother is just reserving the truth for later, saving that sort of conversation for a more appropriate time and place.
See the difference?