Grayed out boxes in the the 'Greek NT Interlinear with Strongs numbers?

Hi,

Why are there Grayed out boxes in the the 'Greek NT Interlinear with Strongs numbers?

I had been told that it is because the greek word in the grayed box is not in most earlier Greek text.

Is that correct?

Appreciate the help.

Bless you

Gary

The Greek NT INT+ use the ΝΑ28 [=UBS5] as default text.

So when Byzantine or Textus Receptus sources disagree with the ΝΑ28 [=UBS5] are they grayed out.

And what the most earlier Greek text should support in every variant unit is very controversial and a hot topic in debate.

The ΝΑ28 [=UBS5] is not the only modern "Critical Text "source nor the only with supporters.

All standard texts claim that they are the closed by the "Originals".