Kind of strange to put money into it if LH is planning to retire them...
Not really, it's a tough time for everyone.
To give a siomilar example, air france KLM originally announced that they would retire their B747 fleet and replace it with A380 and B773ER (depending on the demand).
Due to the difficult context (and the fact that they are highly indebted), they postponed this retirment for 2 to 5 years, and refurnished the a/c, painted the new livery on 2 of them already.
It's just... tough by now for everyone.