@tonyOmahaz5,
Some research was needed and the only reliable source is ARS GRIN and this is what they said “Tennousi - Hybrid cultivar, low chill, fire blight resistant. Open pollinated seedling of Tennessee possibly pollinated by Hosui. Developed by Harris County, Texas extension agent Bill Adams, who collected seed of Tennessee about 1992. The only pear flowering nearby at the time was Hosui. Tennousi may be immune to fire blight. In 20 years it has never become infected in Natelson’s orchard in Houston. Fruit large, uniform, round like Hosui, but with European pear texture and flavor; Ripens well on the tree; Does not oxidize when cut. One of the best pears for the Houston area. May be self fertile. Tree requires 550-600 chill hours " - https://npgsweb.ars-grin.gov/gringlobal/accessiondetail.aspx?id=1837425
If you look at the photo here https://npgsweb.ars-grin.gov/gringlobal/accessiondetail.aspx?id=1507865 of Tennessee it’s coloring is similar as you can see here
ARS GRIN said this about TENN " Excellent quality, medium sized dessert pear. Reportedly came out of the Tennessee breeding program with Ayres. Apparently there is more than one cultvar propagated as Tenn in the South. This is the good one. It has a slightly pyriform shape, fairly uniform, and has a nice red blush on one side. About 350 - 400 chill hours (commonly sets two crops in Houston). Tree is very large and spreading on calleryana.”- https://training.ars-grin.gov/gringlobal/AccessionDetail.aspx?id=1507865. You can see a spreadsheet of most of the pyrus cultivars here https://www.ars.usda.gov/ARSUserFiles/20721500/Postman/USDA%20Pyrus%20germplasm%20collection%20-%202016.xls
This is the catalog I used before https://www.ars-grin.gov/cor/catalogs/pyrblres.html which said this about Tenn aka Tennessee " Excellent quality, medium sized dessert pear. Reportedly came out of the Tennessee breeding program with Ayres. Apparently there is more than one cultvar propagated as Tenn in the South. This is the good one. It has a slightly pyriform shape, fairly uniform, and has a nice red blush on one side. About 350 - 400 chill hours (commonly sets two crops in Houston). Tree is very large and spreading on calleryana." - https://npgsweb.ars-grin.gov/gringlobal/accessiondetail.aspx?accid=%20PI+617601
Unfortunately the USDA had no pictures of tennousi but pictures can be seen here Pear (Pyrus 'Tennousi') in the Pears Database - Garden.org clearly without much if any red blush. Jon on that site took this photo
We know that picture of tennousi is accurate because we can cross reference it in your article you posted which mentions Dr. Ethan Natelson M.D. The pear expert in Texas. The article Eaton Rapids Joe: A Pear called Tennis Shoe Shows a basket of tennousi From this website http://southernfruitfellowship.com/tenusi.jpg
. We know tennousi does not brown when cut right away as others do. That makes tennousi very easy to identify. It’s possible your pear is Tenn so now we compare leaves of your photos below 
Leaves are similar but now we need leaf close ups and time for the fruit on your tree to mature. It does look very much like Tenn to me. If you need close ups of the leaves I do grow Tenn so let me know. Thanks.
