Canada's overnight rate

I’ve pasted what a guy said on BNN today about Canada’s decision to lower their overnight target rate to 1%. can someone plz explain what he’s saying? why is the cash now worthless? hes comparing the BA rates to the margin in his account, what does this ratio tell us? thanks. “I’ll tell you why I think its working. I"m an investor. I’m sitting in 25% cash of my portfolio right now, thats a lot of cash. its now worthless. the cash isnt doing anything for me. the BA’s are less than the margin account that the cash sits in. So waht do I do? I can’t let that cash be completely worthless and not even stay with inflation. I have to put it to work. I’m being forced by these nasty bankers to do something that I’m not ready to do yet.”