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Awesome news for the swimming pool, this is probably the 'sport' I like the most.

A shame there are so much people in them sometimes :)

thank you for the heads up

Again something that looks dreadful but it's not so bad. Lack of all prices means that the sub is no longer sold. A key can be activated on a country without price set AFAIK. I see people asking friends to buy them a game because there's no price set for e.g. Australia.
But I'm not sure of that for a key, maybe someone else with better knowledge can confirm either way, make a thread about it and we'll get out of doubt. I wonder why we don't have a little FAQ thread about region restrictions and some of these infos and tricks.
And well, in case of doubt, it's better to be on the safe side, so yes you did well. Here, have a cookie 🍪

I can confirm what the others said: your sub is free of region restrictions and the key can be activated anywhere and everywhere, since the according app also has no restrictions. The "No cross region trading and gifting" is only related to old inventory gifts and a lack of price(s) only affects buying or gifting it directly in the Steam store.

So your sub is simply not being sold directly in the Steam store (and has never been, if you look at the price history graph for any of the currencies) and the other sub you mentioned is not being sold directly in the Steam store in Russia (or any region paying in Ruble) and can also not be gifted via Steam store to accounts in that region/using that currency. Key redemptions are not affected by that at all.