Execute Surface Desiccation: Season steak evenly on all sides with coarse kosher salt. Place uncovered on wire rack over baking sheet. Slide into freezer for exactly 45 minutes to chill core and dry exterior.
Apply the Lipid Shield: Remove from freezer. Pat dry any surface condensation. Season with black pepper. Brush avocado oil uniformly over all surfaces using pastry brush.
Convection Pre-Blast: Preheat air fryer to 400°F (204°C) for full 5 minutes before adding meat.
The Searing Cycle: Place oiled steak flat in center of preheated basket. Cook at 400°F for 6 minutes. Flip with tongs. Cook additional 4-6 minutes (4 for 1.5-inch, 6 for 2-inch steaks).
The Critical Thermal Pull: Insert digital thermometer into thickest center. Remove immediately when reading 120-125°F (49-52°C) for medium-rare.
Capillary Rest Matrix: Transfer to cutting board. Rest uncovered for 8 minutes. Carryover heat will reach 130-135°F (54-57°C). Slice against grain and serve.