The VWP(N) official line after committing was either General Offensive / General Uprising or General Offensive.
The use of the PAVN to bolster PLAF regular units was policy and strategy. This strategy was intensified as a result of US intervention, but was always present.
Official lines don't mean much. Officially, all of the players in the Cold War were totally committed to wiping out all of the other players for (pick your reason). Factually, they all tended to sit on their hands because they knew perfectly well actually trying to implement the official line wasn't going to end well. The same's true here. Will the PAVN actually
say, "Oh no, we're giving up on South Vietnam, no attacks for us"? No, of course not; they'll still keep talking about the General Offensive and maybe some Uprisings to go along with it. But if (somehow) the Viet Cong get shut down and GOGU is a dead letter (no General Uprising to be had), the only option left is rolling tanks across the DMZ, just like in '75. And if the United States hasn't already intervened and withdrawn, that carries the huge risk of the United States getting directly involved and completely smashing the PAVN in a straight-up fight. It's hardly reaching to suggest that PAVN leadership will be less than enthused about running that risk, regardless of their official strategic thinking. It's not like other Communist countries were super-enthusiastic about provoking that kind of thing, in general (or vice-versa, non-Communist countries that were super-enthusiastic about charging into the teeth of the Red Army).
Of course, this is all predicated on the underlying assumption that SF and advisor support
could allow South Vietnam to eliminate insurgent activity and become a more or less stable and internally secure state, which is a more dubious proposition. I'm not sure that that's actually possible without basically completely changing everything about the Republic of Vietnam's government. If that's your bag, sure, but in that case the SF and advisor support is more ancillary than anything else.