True Strike, Innate Sorcery, and magic items.

Quote from sdyvn>>

thanks. i see that now, though i do not like it :(  

As you said, i noticed true strike is worded differently than others like Booming Blade and Green Flame Blade which involve spell components but clearly state take the normal attack. 

As part of the action used to cast this spell, you must make a melee attack with a weapon against one creature within the spell's range, otherwise the spell fails. On a hit, the target suffers the attack's normal effects,

It seems like an oversight on the True Strike spell wording.

Clearly, if you cast True Strike, then you make a weapon attack, that is part of the spell. (It says so in the spell description.)

Also, if I make a weapon attack, then I make an attack roll, that is part of the weapon attack. (Has been mentioned several times already.)

There's a base property of all rules systems called transitivity: if one thing is part of another thing and that other thing is part of a third thing, then the first thing is part of the third thing.

Therefore, the attack roll is part of True Strike. (Side note: Counterspell couldn't prevent the attack, if it were not part of the spell).

Innate Sorcery: "You have Advantage on the attack rolls of Sorcerer spells you cast."

It boils down to this question: What does "of" mean?
Unless it's defined somewhere in the actual game rules, that I am not aware of, it means "belonging to", "being related to" or "being a part". All three options support the relation above.

It is an attack roll and it is (part) of a Sorcerer spell. Nothing else matters to Innate Sorcery, as stated above multiple times already.

Conclusion: I do have Advantage on that roll.