De or het alt-lite?

The correct Dutch article is:

het alt-lite

Exception Words ending in -te usually take de, but alt-lite is an exception. See the rule
Meaning (Dutch) (politiek) extreem rechtse politieke groepering die minder extreen is als alt-right

How to use alt-lite

the alt-litehet alt-lite
this alt-litedit alt-lite
that alt-litedat alt-lite
our alt-liteons alt-lite
your alt-litejouw alt-lite
every alt-liteelk alt-lite
which alt-lite?welk alt-lite?
a big alt-lite / the big alt-liteeen groot alt-lite, het grote alt-lite

Meaning, plural, diminutive, pronunciation and translations: WikiWoordenboek (Dutch Wiktionary) (CC BY-SA 4.0). Example sentences: Tatoeba (CC BY 2.0 FR).