Questions & Answers about Не те щоб полуниця дорога, але вона ще не стигла.
Yes, не те щоб is an idiomatic expression meaning something like:
- it’s not that...
- not exactly that...
- it’s not really because...
In this sentence, it softens or corrects a possible explanation:
- Не те щоб полуниця дорога...
= It’s not that the strawberries are expensive...
The speaker is saying: price is not really the problem. The real issue comes in the second part: але вона ще не стигла.
A very natural English rendering is:
- It’s not that the strawberries are expensive; they’re just not ripe yet.
So yes, it is close to English not that, but as a fixed Ukrainian phrase it often has a slightly hedging, conversational feel.