The hashrate actually started to drop last friday. Yesterday it was as low as 353 Ph/s, now its at 379.
Bitcoinwisdom probably uses a longer median over-time measurement

"bitcoin-cli getmininginfo
{
    "blocks" : 375480,
    "currentblocksize" : 0,
    "currentblocktx" : 0,
    "difficulty" : 59335351233.86656952,
    "errors" : "",
    "genproclimit" : -1,
    "networkhashps" : 379792774705613248,
    "pooledtx" : 2834,
    "testnet" : false,
    "chain" : "main",
    "generate" : false
}"