Why waste so much electricity with the brute force attack when you just need to solve a simple mathematical problem? 
https://decrypt.co/59340/ancient-bitcoin-whale-just-moved-5-million
https://decrypt.co/59340/ancient-bitcoin-whale-just-moved-5-million
1. The news only says someone move lots of Bitcoin (which had old UTXO age) with speculation it have some influence on Bitcoin price
2. What is the simple mathematical problem? Finding private key if someone reuse k value?