And if it was not true, if someone had the access. Did the Canadian authorities checked about it ?

https://thebitcoinnews.com/quadrigacx-founder-takes-126-5-m-e-to-the-grave/
QuadrigaCX founder takes 126.5 M € to the grave - The Bitcoin News
Canadian news portal The Globe and Mail reported that QuadrigaCX, a Canadian crypto exchange, lost $ 126.5M ($ 190M) worth of cryptocurrencies...