The base_reserve_in_stroops says 5,000,000 (0.05 XLM) in the following URL. This is a recent ledger entry. Does this mean it only takes 0.1 XLM (2 * 0.5 XLM) to create an account now?
As stated here https://www.stellar.org/developers/horizon/reference/resources/ledger.html that's:
The reserve the network uses when calculating an account’s minimum balance.
It's not the account’s minimum balance itself.