I like the way they "cure" him with antimatter and he
doesn't explode like a Warp Core breach!
Although ... the episode WAS kicked out of canon.
The later season ('Day of Honor' episode) confirms that by Torres stating: 'We don't know anything about TW technology. Playing around with it could be dangerous.'
And Tom stating something along the lines of not flying through TW before (in the same episode).
So technically speaking the episode happened yes. However, is it part of canon? Unfortunately no.
I'd personally want it to be, but alas, it's been kicked out of canon and it stuck like that in later seasons.