Does it mean, that they:
1. Have +50% accuracy bonus from stealth with vet 5?
2. Additional +25% accuracy from stealth on the start?
3. Vet 5 bonus now not 50%, but 70%?
And in total - +95%?
It means they should now have:
+25% First Strike bonus at vet 0, and 1.25 x 1.2 = 1.5 or +50% First Strike bonus at vet 5.
The notes should say that vet 5 +50% was changed to +20% to be less confusing, thanks for calling it out, we'll change it.