So Riot said they are buffing other Keystones to match Thunderlord's...

I believe they meant the other offensive spells.

But yes, as a tanky support user, I'm a tad bummed about this nerf, I'll have to check if it's still worth the pickup or check the others.

In case you weren't aware bond of stone has been the go to pick for almost all tanks for a while

Edit: Excluding Singed/Nasus but they are weird

Can you provide proof of them saying this or just the community?

m8, it was 3% for yourself, which doubled to 6% for your allies when they take damage from enemy champs. Now it's 4% for yourself, and you still have 6% for your allies when they take enemy champ damage

It's a buff for the junglers that were taking it even though Strength of the Ages was better.