Back to the opener, then.
To me it is quite obvious:
The ad's spelling IS horrible.
Perhaps the advertiser did this willingly, or at least consciously, to vent frustration.
Perhaps it was done unconsciously, through some kind of linguistical handicap.
Now I would be VERY careful, to say the least, buying from anyone unable or unwilling to control their emotions, especially towards outsiders, or to be aware of and compensate for their own limitations.
If even the ad is substandard, what would the actual state of the plane be? It might be OK, but it seems unlikely.