Is it still deflationary? Wondering if I should invest in the coin itself (which makes sense for deflationary coins) or a company doing something with it (which makes sense for an inflationary coin)
Some people, Austrians define any change in the amount of base currency as inflation/deflation. This is the traditional definition.
However the normal everyday usage of inflation/deflation talks about the 'General Price Level', usually measured with things like GDP Deflator, or CPI. Some way of trying to measure the general price level. All of those measures are imperfect.
By the first definition, both Bitcoin and ETH are inflationary but only slightly so.
By the second definition it is very hard to say because we don't really have a way to measure it.