False.
Because the Wyvern FM wasn’t changed. It was last changed in March.
The line in the Gaijin changelog you saw is just an x-ray text.
Yes,my Do-335 B-2 now completely compress elevator at 650 km/h,0 authority,before even at 700 i could still pull to not crash. And Early F/A-18C and CF-188 can now pull 12G just with mouse,before without keyboard help they couldnt.
I don’t know what an xray text is but I do know that when some one says 450kg is added to a plane it should have some effect on performance.
This should be communicated better in the patch notes.
I believe that gaijin has managed to fix the erroneous bugged drag+weight for certain aircraft guns with the most recent patch. I personally only tested the F4U-4, P-38L, F2G and they are back to being able to achieve the top speeds listed in this chart. War Thunder Top Speeds at Sea Level - Google Spreadsheets