Interesting translation. It was indeed God's special time and the Sabbath is indeed God's Sabbath and not just a Sabbath for the Jews. And in any case, God at that time gave the 10 commandments to all of the House of Israel (all 12 tribes)--not just to the tribe of Judah or to Judah, Benjamin, and Levi that would later make up the southern kingdom--the Kingdom of Judah.
if you accept the Sabbath as for "everyone" accept all the other Mitzvas too. if not, than acknowledge that G-d was talking to Bnai Yisroel. B'nai Yisroel is a specific family which became a nation. it is NOT universal.