Marx was certainly influenced by Hegel his whole life. But I doubt in his mature years he would have liked to be called a ‘Hegelian’. It was an influence he adapted rather than blindly imitated. The Hegelian Marxism stuff is a step backwards, not forwards.
Though remember, in one of the prefaces to Capital he famously says (speaking of Hegel) “I therefore openly avowed myself the pupil of that mighty thinker, and even here and there, in the chapter on the theory of value, coquetted with the modes of expression peculiar to him.”