Bike-Tech was a brand from Markus Storck, he started already in the 80ties to import bike parts and sold it at the small bike shop from his father in Frankfurt area, Germany.
Beginning of the 90ties he was the key Klein dealer in Germany.
At this time he started to offer also own Bikes and nice parts with the name Bike-Tech.
1995 he has started a new brand called 2-Danger, but just for very limited time,
since 1996 he's using Storck as brand.
https://www.storck-bikes.com/en/history
Bart Brentjens American Eagle bike used to win Atlanta Olympic Gold in 96 medal was actually a custom aluminum frame from Storck.
So far on the brand, maybe fair to say is as well that not everyone could get along with Markus Storck well as he was always a bit of a busybody...
With regards to the mentioned bike.
1997 is very late, if not too late for a Bike-Tech bike, as Storck stopped producing Bike-Tech bikes already a bit earlier. 1996 already only two models, the Hikari and the Cross bike had been still offered.
There had been some Titanium prototypes shown at bike shows also roughly 95, but not sure if they ever started serial production.
Bike-Tech bike have been known for nice Toyo steel frames, no Aluminum and like said not sure about Titanium.
If you're not sure about origin of a potential offer, I would recommend to reach out to Storck to ask about their opinion. Maybe you will get an answer.