I have heard this before. People stating they like something that was previously awful and vise versa.
The thing is, it is very hard to pin down why, my conclusion is that it could be due to
1) the flavour HAS changed and has different suppliers of ingredients or whatever
2) the reviewers taste buds have changed
3) different devices or equipment
4) different voltage
Or a blend of two or more or all of the above.
I know that is vague, but the only thing I am sure of is that we are on a never ending voyage, chasing the flavour we are after, cycling over and over through every flavour in the world of vaping, each time getting a different experience and that in 10 years we will still be having this conversation still discussing the merits of atties that only last a year and the Provari 8 due out any moment that find the sweet spot for you.