Google maps is now showing I-269 as open.
The map on my iPhone is also showing it as open.
I contacted Google about 2 weeks ago and told them it was open (knowing it would take at least a week to fix it
)
I also contacted Here maps with an exit list 
I hate to say it, but do you know how Google knows?
When Android phones start traversing the route regularly that is on a lat-long not recorded in their maps database. Throws out an exception because people are now driving where they (Google) had no road before.
This is also how Google "knows" a road reopens.
Another way is Google Maps will throw up an alert asking if the way you traveled is open.
This happened to me during the Meramec River flooding which caused I-44 to close temporarily. Maps still showed the road closed, but it had just been opened by MoDOT and Maps pinged me to validate that the road was in fact open. About 15m later the closed symbols on maps fell off.
The amount of data Google collects is pretty astounding, especially on road use.