There is an earlier law (Kodeks Karny, 1997) which sentences up to two years in prison:
Kto publicznie propaguje faszystowski lub inny totalitarny ustrój państwa lub nawołuje do nienawiści na tle różnic narodowościowych, etnicznych, rasowych, wyznaniowych albo ze względu na bezwyznaniowość, podlega grzywnie, karze ograniczenia wolności albo pozbawienia wolności do lat 2.
Whoever publically propagates fascist or other totalitarian modes of goverment [...] is subject to a fine, restrictions on freedom or loss of freedom for a period of two years.I think the later variant is the one pushed through by PiS last year which also bans Communist paraphernalia in the same way. Frankly it's the usual PiS posturing and the likelihood of actual prosecution arising from Poland's notoriously imprecise legislature is minimal - inference from the pictures of Bierut hanging in the window of the Proletaryat pub here in Poznań.
In any case, given the wording of the law itself, it would be incumbent on any plaintiff to prove that the mere public presence of these artefacts constitutes 'propagation' - ie, is it definitely being used to convince people to support the Nazi/Fascist ideology?
Propagowanie, w rozumieniu art. 256 k.k., oznacza każde zachowanie polegające na publicznym prezentowaniu faszystowskiego lub innego totalitarnego ustroju państwa, w zamiarze przekonania do niego.
Propagation [in this law] denotes any behaviour entailing the public presentation of fascist [...] with the aim of persuasionWell, there's your question. Is it? Personally I'd burn the bloody stuff but the law needs proof of intent if you expect any kind of prosecution.