The President of Hungary acts very childish, if he is against Biden he should not openly and publicly post it and just make it personal if he wants to bet against Biden, what he wants to prove here, that he wants to please Trump?
His action back fired now he wants to make amends by congratulating Biden, not really good move for the current President of Hungary.
I agree with you, what was his point of making his beliefs so public? Now it will just be more difficult for him to have a good relationship with Biden. I mean nothing is wrong to say who is your favourite, but you should always try to keep the backdoor open. Because he is acting for the best for his country, not his own personal preferences.