The ASA has found that the content put out ahead of release and its Steam page were largely representative of the final product, and unlikely to have mislead customers. Some differences between the trailer and the final product were noted by the ASA, but were not deemed significant deviations by the regulator.
A recent "Foundation" update to No Man's Sky was positively received and reportedly brought thousands of disgruntled players back to playing, at least initially.
You van view the ASA's final report on its investigation of No Man's Sky on its website.