Francois de Meules lived so far back in time, that autosomal DNA matching would not be expected among currently living descendants.
His son though, is close enough so that some matching might be possible. I need to emphasis the work "might" because the amount of matching expected for Joseph Demeules is limited.
The GEDmatch Ref number that was provided does not match typical GED numbers.
With valid GEDmatch numbers it possible to compare the DNA of 2 people and see how much (or how little) they match. However, one needs to be very careful.
For example, I match 8.3cM with the descendant Eva Marie Desmeules. Some researchers might consider that significant. However, she does not match either of my parents at that level or above. So, I know my 8.3cM match with her is really just a random match, which can happen at low levels.
That the other person thinks that a person "might" be a Huguenot, does not really help much.