Fair comment, stb was perhaps pushing it. First thought was it was a debris trail as if both engines have been pictured, where is the other wing.
With respect to other recent musings, re-reading the BEA report reminded me that a concurrent flight had to carefully adjust the weather radar to get the full picture and that no big issue is made of the difference between ACARS 'WRN' and 'WRG' : it doesn't reference interconnection failure for the latter, just a mistrust.