Astons does not provide legal advice on specific renunciation laws, requirements, and consequences for renouncing any nationality.
Superficially, the simple act of renouncing citizenship would not erase any existing tax liabilities or tax evasion matters.
In fact, for most countries, a part of the renunciation process is a tax audit.
If you seek advice, guidance, or assistance that is specifically related to renouncing your citizenship, you need to contact a lawyer in that country who specializes in tax and renunciation law.