This could actually be a sign that they believe the economy is about to heat up; that they’ve weathered the storm by being in treasuries and it’s time to enter the market again.
Gross cannot enter the market, if by “market” you mean the market for equities.
He indicates he will get back in bonds if rates go up 1.5% or so (of course, by the time rates climb that much, he may think they need to climb even more for bonds to be at fair value).