I don't see it. The whole point is that there is risk for the Oxy to make the payments and therefore will need to sell "stuff". The WES 8 billion estimate on top of Total match the high side of their commitment to market.
Unfortunately you also have Icahn out there pressuring for "results", so depending on his traction we may see further acceleration and/or expanded sale scope. Every vote he gains is against the employees and damaging the potential for company success post-merger.
There is a listed risk in proxy that Total deal may not go thru and multiple other issues raised which are potential scenarios of some probability but mainly I view them as a way for APC to cover against litigation (note the article statement that the additional info is responding to claims of incomplete information and transparency).