Well looking at Turkey's referendum, it basically shifted from a westminster-style parliament more to a US-style presidency. That - by itself - doesn't really mean he's a dictator.
If you look at some of the changes in turkey they weren't all clearly just pushing Erdogan's power:
https://en.wikipedia.org/wiki/Turkish_constitutional_referendum,_2017#Constitutional_amendments- The number of seats in the Parliament is raised from 550 to 600.
- Parliamentary terms are extended from four to five years. Parliamentary and presidential elections will be held on the same day every five years, with presidential elections going to a run-off if no candidate wins a simple majority in the first round.
- The age requirement to stand as a candidate in an election to be lowered from 25 to 18, while the condition of having to complete compulsory military service is to be removed. Individuals with relations to the military would be ineligible to run for election.
- The President's ability to declare state of emergency is now subject to parliamentary approval to take effect. The Parliament can extend, remove or shorten it. States of emergency can be extended for up to four months at a time except during war, where no such limitation will be required. Every presidential decree issues during a state of emergency will need an approval of Parliament.
- The acts of the President are now subject to judicial review.
- The President used to appoint one Justice from High Military Court of Appeals, and one from the High Military Administrative Court. As military courts would be abolished, the number of Justices in the Constitutional Court would be reduced to 15 from 17. Consequently, presidential appointees would be reduced to 12 from 14, while the Parliament would continue to appoint three.
- To overcome a presidential veto, the Parliament needs to adopt the same bill with an absolute majority (301).
- Military courts are abolished unless they are erected to investigate actions of soldiers under conditions of war.
- The President becomes both the head of state and head of government, with the power to appoint and sack ministers and Vice President. The president can issue decrees about executive. If legislation makes a law about the same topic that President issued an executive order, decree will become invalid and parliamentary law become valid.
Those are some of the relevant ones, they're all pretty tame stuff compared to e.g. American presidential powers.