Yep, it affected the price of BCHABC because it has pumped after the news of BSV's delisting on Binance and other exchange that followed. Assuming that most of BSV investors dumped their boat and jumped to another boat which is the BCHABC.
should I invest in BCHABC now?
Only you can answer this.
will the fall in the price of BCHSV pump up the price of BCHABC ?
Likely which I believe somehow.