Albania is outside the EU so that makes things more complicated in terms of challenge but restricting movement to another EU/EEA Member State (or the UK until the end of the year) without valid public health justification (or public policy/security justification) is contrary to EU law.

Actually, this is not a valid ground of movement as such. You would need to establish that there is a motif familial impérieux, which they seem to interpret as situations characterised by a certain degree of urgency and where it is patent that the individual clearly has to travel right now to address the issue (eg: death, serious illness of a relative, imminent danger or need for assistance for them, etc...).

It is not just 'leisure' travel that is not covered by the rules. It is travel for any reason other than one that is specified in the legislation. Strictly speaking, the legislation would seem to not even allow you to return home if you are resident abroad. This may seem strange but it is not one of the recognised derogations in there. Also: what if I have urgent repairs to carry out on a property abroad or indeed any other urgent matter there other than the short list of specific reasons listed in the derogations? Seemingly not allowed. Joining a relative abroad? Seemingly not allowed unless the motif is impérieux. Moving to your residence in another country to be less exposed to covid19 risks ?Seemingly not allowed, etc...