Yes, but "attack rolls of Sorcerers spells" use the modifier of the spellcasting ability, not Str/Dex.
So does Truestrike.
Yes, but "attack rolls of Sorcerers spells" use the modifier of the spellcasting ability, not Str/Dex.
Really it depends.
Is the attack from True Strike a spell attack or weapon attack
Spell attacks are still called out, though.
"Clenched Fist. The hand strikes a target within 5 feet of it. Make a melee spell attack. On a hit, the target takes Sd8 Force damage."
You are not making a melee spell attack with True Strike. You are making an attack, which is like an attack from the attack action.
Also, spell attack is in fact a separate category. It has it's own paragraph.
"SPELL ATTACK
A spell attack is an attack roll made as part of a spell or another magical effect. See also chapter 7 ("Casting Spells")."
To be a spell attack, it needs to say melee spell attack or ranged spell attack. If it doesn't, it's not a spell attack.
The distinction is whether or not it's a attack from the spell which uses your spellcasting modifier or an attack from your weapon which uses your weapon's chosen modifiers.There is no such distinction in the 2024 rules.
The ability doesn't specify "spell attack" though. "Attack roll with a spell" may or may not be the same thing as a "spell attack". The rules do not say. I.e. the correct answer is "the rules are vague, so the DM decides".
The part you quoted doesn't say what is in red and it is a stretch to draw this conclusion, I would also say Truestrike is an attack roll made as part of a spell.
Moreover, I will point out that Innate Sorcery feature itself does NOT say "spell attack" so if something "needs" to say to say the exact words "spell attack" and without those words it means another kind of attack, then the Innate Sorcery ability must be referring to a different and broader set off attacks and not just "spell attacks".
For me it is pretty simple - if the spell and thereby the attack can be counterspelled then it is an "attack roll of a sorcerer spell" and it would have advantage. So Truestrike yes, Booming Blade yes, Chill Touch yes, Chromatic Orb yes, attack from Bigby's Hand no, attack by a summoned creature no, extra Haste attack no, attack with a Shadowblade or Flameblade no.