Is Europe Elect's classification of SVP in Reform Europe (= Liberals) a joke ?
Might be a relic from when the SVP was a de facto agrarian party - many of those joined ALDE renew europe.
But ALDE/RE has always been a bit of a trash collector - most hilariously, one of their members is Bulgaria's DPS, which is basically AKP Abroad. They also contain Estonia's whatever-but-definitely-not-liberal populist Centre Party, Lithuanian Labor Party, or Fianna Fáil. IIRC, at one point, Slovakia's now-defunct authoritarian-nationalist HZDS was also a member.
SVP is in the ALDE group of the Parliamentary Assembly of Council of Europe - I'm surprised they didn't kick them out.
As for HZDS, they weren't members of ALDE, but of the European Democratic Party, which sits in the same group as ALDE.
BTW ANO of Andrej Babiš is also in ALDE...