if Venedi were Slavs deserves probably a separate topic.
regards the question if East Germans were Slavs we may definitely say
that Goths were not.
Because many texts in Gothic language remained.|
example Bible was translated to Gothic. You may find this texts
decide if Gothic language was a Slavic one.
liuhtjai liuhaþ izwar in andwairþja manne, ei gasaihvaina izwara
goda waurstwa jah hauhjaina attan izwarana þana in himinam.”
it resemble something in Slavic?
if we look to English translation:
your light so shine before men, that they may see your good works,
and glorify your Father which is in heaven.”
find that many Gothic words are similar to English ones:
– light, manne – men, goda – good, þana – Father, in himinam
– in heaven.
And English language is a Germanic one.
is not so good with Wandal and Burgundian languages so there may be
some doubts if they were really Germanic.