How does Aave handle insufficient liquidity for withdrawals?

I have a question about a part of the FAQ on withdrawing:

"ou would need to make sure there is enough liquidity (not borrowed) in order to withdraw, if this is not the case you would need to wait for more liquidity from suppliers or borrowers repaying.

Just to make sure I understand this, say I supply USDC to Aave. If there isn't enough USDC available in the pool when I try to withdraw, do I just have to wait until there's sufficient USDC? Has that situation ever happened in the past? Is there anything Aave can do in that situation (e.g. force repayment of loans, swap other collateral into USDC, etc.) to obtain USDC for withdrawals? Thanks!"