1. No, halving does not create deflation. We'll start getting a real deflation only when the last coin is mined. As @NeuroticFish rightly pointed out, we can say that in our case halving is a decrease of inflation.
If you mean 2140, I think it's too far away from us to think about it. But what's interesting is that we don't know for sure how many coins are lost every year, so, theoretically, it's possible that we have already entered the deflationary phase. According to Chainalysis, between 17 and 23 percent of all BTC is already lost irrevocably. Who knows how many BTC will be lost during the year after the next halving, and whether that amount will not be greater than what will be mined during the same period of time?
I mean it's not that hard to calculate how many BTC will be mined from May 2020 to May 2021.
We have around 52,560 blocks per year, so
52,560 x 6.25 BTC = 328,500 BTC
It's only around 1.6%, so it's possible that over that amount will be lost during the same time.