To me, a fluent Spanish speaker, it sounds like a Spanish person with a foreign accent.
The pronunciation and grammar sounds a little bit off (with respect to Spanish), but otherwise I can understand this 100%.
As a native German speaker who also knows English (obviously), I'd rate the comprehensibility of the others as follows:
Swedish: understood just a few words
Dutch: understood some entire phrases
Yiddish: understood entire sentences, but there were still some words I couldn't recognize, which I guess might stem from Hebrew or Slavic languages. (But I did know about some of the more regular sound changes relative to German before, like Augen → Äugen.)
Scots is absolutely a different language from English, despite it being intelligible. I can't produce that speech, even with an accent. It has different rules and formations that My English just doesn't have.