"Interest Rate On Steem Power Is Falling Fast" what????

I just read this post by @calaber24p
https://steemit.com/steemit/@calaber24p/why-i-have-decided-to-stop-powering-down-my-steem-power-for-the-long-term
he's someone very active in the community so I have to take it seriously.
especially this part seems very concerning for those who invested in Steem Power:

"The interest rate when I first started was around .075% a day, but now only a month and a half later is only around .058%. The interest rate on steem power is falling which overall is going to lower inflation and the selling pressure on steem in the future. If you are worried about the price of steem falling in the short term, hold onto your steem power until the interest rate goes to nearly 0% and we will see less selling pressure.This is because the amount of steem being created is getting smaller, so there is less to drop on the market "

Apart from the reasoning which seems counter-intuitive (you'd think an higher interest rate would make holding more attractive) it's the reference to a reduced inflation and therefore a changed system that I find bewildering .
unless the rules have changed:
The inflation for Steem is set at 200% for the 1st year and 100% for every year there after.
out of all the Steem created 10% go to those holding Steem Dollars and 90% to those holding Steem Power.
Therefore Steem Power should have an yearly interest rate of of 180% for the 1st year and 90% there after .
was anything changed?