It’s called massive offshoring of everything they can, including R&D. I seem to recall that at last count the percentage of their employees still in America was somewhere in the high 30’s or at best low 40’s.
I agree with you to a point. The company, however, is increasingly services based. It does services around the world so it is reasonable that their employment should reflect that. They do still make the majority of their hardware here in the US.
That' reflects a bit of a change. IBM does a lot of services these days, and those services are international. Thus, they have a lot of local employees of foreign subsidiaries counting towards the foreign percentage.