I say yes, but there are people who jump on any use of these terms and say polarisation can only refer to the river, not earlier. The logic seems to be that any hand has outs before the river, and also that solvers do show (some) condensing actions even when playing with quite polarised ranges, and polarising actions even when playing with quite condensed ranges.

Do they have a point?

My answer is as follows: This all sounds reasonable in small doses but it would be over the top to think we can therefore ditch the concept of polarised and condensed ranges until the river. If someone's range is capped pre-flop and they keep taking condensing actions post flop, why isn't their range condensed?

Likewise if the PFR takes condensing actions on flop or turn. Unless solvers consistently advise checking/calling with strong and terrible hands at such a high frequency that someone's pre river play tells you almost nothing about how polarised their range is, I don't think we can dispense with the concept. A solver might check back the occasional flush on the flop or something, but I am sceptical that this kind of action with this type of hand is a large enough part of the range to render polarisation not a thing pre river.

In practice, if someone is playing remotely close to theory then a (non-range) flop cbet is polarising and a check is condensing. If someone calls that bet rather than fold or raise, they are condensing and so on.

If ranges can be capped on the flop and air heavy on the flop and so on, why can't they be polarised or condensed too? "Oh, for sure he's capped his range and he would have folded most of his air but for God's sake don't ever say he's condensed his range when he calls that flop cbet!!!!!" makes no sense to me.

For sure it can. We see this all the time after betting small on the flop - we do lots of checking on the turn, and if we are OOP, trap lots of strong hands to protect our condensed range.

Whereas if we bet big on the flop, we tend to continue betting more often on the turn, and there is less need to trap with strong hands when our range is so polarised.

A range in practice will almost never be fully condensed or polarised, but I guess we have invented words to be able to use them, so we call things polarised or condensed relative to the opposing range usually. In that sense yes, you can have a polarised or condensed range anywhere

Polarity is a spectrum.

You can think of it as the least polarized range being perfectly condensed/depolar, and the most polarized range being pure nuts and air.

In practice, almost every range you encounter will be somewhere between those two extremes. This is especially true on earlier streets when most hands have equity to outdraw each other.

For example, here's an equity distribution chart for a turn overbet spot. Note that the BTN is mostly repping very strong hands and bluffs, whereas the BB range is flatter, repping mostly bluff-catchers. This range is "polarized", and the strategies associated with polar ranges apply. But it's not perfectly polarized, and that's ok.