The English Law book is quite clear: you need both requirements. Perhaps the French translation has become slightly skewed: I shall have a look and comment further.
You cannot change a call under Law 25A once partner has called.
You cannot change a call under law 25A if you have paused for thought, but TDs are instructed to be generous in their application of this.
And, of course, you may not change a call under this Law unless the original call was inadvertent.