Implication details
Claim: If a category has filtered colimits and has pullbacks and has reflexive coequalizers, then it has sifted colimits.
Proof: See Chen, Cor. 5.2.
This implication has a dual.
Claim: If a category has filtered colimits and has pullbacks and has reflexive coequalizers, then it has sifted colimits.
This implication has a dual.