No that's incorrect. You're right that the article de can be replaced by deze (or die in case it's those). But you have to keep in mind that whether you use dit or deze is completely different from when you use this or these in English.
- Dit is het huis
- Dit zijn de huizen
- Het is dit huis
Het zijn deze huizen
Dit is de vrouw
- Dit zijn de vrouwen
- Het is deze vrouw
- Het zijn deze vrouwen
BTW in these examples, if you're interested in that/those you can simply replace dit by dat and deze by die.
Here is some grammatical explanation I found very helpful to better understand this phenomenon:
"When an independent demonstrative pronoun is linked to a noun by a link verb, something strange happens: We are only allowed to use 'dit' and 'dat' (which we normally use for 'het'-nouns), even if the antecedent is a 'de'-noun."
As far as I understand (which may not mean a lot), whenever the demonstrative pronoun is the subject (not just part of the subject!) it is never "deze" or "die", even though it may be followed by a plural verb. You say "dit is" (this is) as well as "dit zijn" (these are – not "deze").