There is no "selling pressure" beyond what has always been there, with 20K coins being mined every day that need to find a home. In fact botnets have likely always been there. What has changed is that demand has dropped from about 80 BTC/day to about 50 BTC/day. That's still quite a lot!
3600 BTC get mined each day, on ASICS only since totally unrentable on CPU based Botnets. (GPU Botnets as argument is invalid, since they have to keep especiall care for NOT getting dedected & cleaned of infected hosts. A 194 degrees Fahrenheit GPU or a fan on 4300 RPM is not exactly that)
20K XMR are like 20*1000*0.0024=48 BTC at current market value which could seek to cash out, at max. Indeed "selling pressure" looks different. That would be holder's panic to dump due to a network attack (been there, seen that)
If demand is like ~50BTC there are several figures NOT fitting. Demand is not higher then supply. Botnet mining for CN coins does not flood the Bitcoin market. Nor have ASIC mining farms found Monero as a long term storage for the parts of BTC mining revenue that does not need to get sold for covering power costs.
But both coins get beaten up. I blame lack of believe in a useability of cryptocurrencies manifestating. The opposite market oppining from the former crypto goldrush.