Caveat: My interpretation of the media report stands to be corrected.
Yes, and I am correcting it.
The article states that it it
cannot be established with 100% certainty that the flaperon does indeed come from the 777 which operated flight MH370.
It goes on to say that the barnacles found on the flaperon are endemic to the southern Indian Ocean.
One anonymous expert is quoted as saying the flaperon would not have floated on the surface, but rather submerged a couple of meters (the article does not explain how he arrives at that conclusion).
Finally, Jean-Paul Troadec, ex-president of BEA, is quoted as saying that the state of the flaperon (largely intact) indicates that the impact with the ocean was not violent, as, in his words, the debris would be smaller than that flaperon.
So there you have it - back to the balance of probabilities. We know that flaperon is from a 777, but we can only assume that it belonged to MH370.