Do the sanctions on the leaders of China actually help them to deepen their autocracy?

Recently Mike Rogers et al introduced a bill to sanction senior leaders of CCP, claiming that the Chinese Communist Party must be held accountable for their egregious and disturbing human rights abuse. But in general, will such sanctions really help with the human rights issues in China, or even deepen their autocracy?

Some personal thoughts: An autocracy usually needs an external enemy to fool their people. For example, using their propaganda system, they can owe the failure of government in economy etc., to the imaginary enemies and incite the nationalism among the mass.

When United States try to sanction the officials of China, by banning their travel to U.S. (IMO they are not interested travelling to U.S. regardless of sanctions) and/or freezing their bank accounts, in my opinion Xi Jin-Ping should feel happy, since this will potentially punish some of his political opponents in China, prevent more officials of CCP from being manipulated by foreign powers and thus boost his anti-corruption campaigns, strengthening his dictatorship further.

How do the sanctions on the government officials of China hurt them, or actually help them? Or, as some people criticized, U.S. only wants to make a gesture to show the world that they "care about" the human rights around the world?