It is true that Fidesz, his party, has won 2/3rds of the seats in the Parliament, though they only got 45.2% of the total votes. This victory was in part due to them significantly re-drawing the regions used during the elections to their favour, changing rules for voting from abroad (making it easier to vote from neighbouring regions where most of the people are traditionally their supporters, but more difficult from other parts of the world, where most of the population would like to see a change). It was also helped by using the state to fund and run their own campaign with virtually unlimited amount of money (they were the ruling party in the previous term as well), gradually taking control of all media outlets (especially traditional print and TV ones, further strengthening their base in more rural areas), etc.
Since then they have taken even more control of the media, diverted the majority of EU and state funds to loyal businessmen (a regular gas-fitter became the wealthiest man in the country in a few short years, believed to be the straw man of Orban himself), filled all major positions with their own people (including most recently the high court), created laws directly against the civil society and LMBTQ+ people, stopped most of the funding to towns that have elected politicians from the opposition, taken control of all universities and actively worked on getting rid of CEU (one of the best, independent university, which was criticised due to being funded by George Soros), signed secret business deals for enormous amounts of money with Chinese and Russian interests that will almost certainly never be beneficial for Hungary, etc.
The comparison to Belarus is not correct in the sense that in Hungary violence has not been used (fortunately), but apart from that the governing party has done everything else they can to keep their power and crush everyone else.