Again. Ifrit Jambe doesn't fit here because it is the same as Diable Jambe out of timeskip.
Consider that Sanji could perform Ifrit Jambe before genes awakening like he used Diable Jambe before timeskip and then the genes awakening was timeskip. He pretty much doesn't even need haki now for Diable Jambe while he uses it just for Ifrit Jambe.
Is not like he is spending greatly amounts of haki in a short period like G4 or KoH.
Consider that Sanji could perform Ifrit Jambe before genes awakening like he used Diable Jambe before timeskip and then the genes awakening was timeskip. He pretty much doesn't even need haki now for Diable Jambe while he uses it just for Ifrit Jambe.
Is not like he is spending greatly amounts of haki in a short period like G4 or KoH.
Sanji still canโt use it now without armament