*Alleged* "hacking". We have no evidence for this allegation except the unsupported word of a British politician. As a British voter I trust Oliver Dowden about as far as I could throw him.
If you had read the cited article, you would have seen that it says,
'In a statement Monday, the U.K. National Cyber Security Centre (NCSC) said it is “highly likely” that the Chinese hackers accessed and exfiltrated emails and data from the electoral register during the hack'.
To anyone who has not been fast asleep for many years, and who has paid even passing attention to the antics of British governments, it will be apparent that the phrase "highly likely" is the same used by Theresa May when announcing the ludicrous and thoroughly discredited theory that "Russian agents" distributed "Novichok" in a bungled assassination attempt in England. She alleged, long before there had been time for any investigation, that the Skripals in Salisbury had been poisoned with "Novichok" of Russian origin. She did not mention that Salisbury - and Amesbury, where it was alleged that Dawn Sturgess actually died of Novichok poisoning - are both within a dozen miles of the UK's chemical weapons lab at Porton Down. VX, considered the world's deadliest nerve poison before the "discovery" of Novichok", was developed and manufactured at Porton Down.
Since then, to the informed, "highly likely" from the UK government means "not".