The Hawks have not been hiding any injuries. What you're mentioning is that we've had a lot of players show up on the official injury report during these last few weeks, and listing them on that report is the opposite of hiding them.
Here's how it works if you are curious about the process.
Starting on Wednesday, every team releases a list of players who had injury concerns and whether they practiced. FP = Full Participation, LP = Limited Participation, and DNP = Did Not Participate. They do the same thing on Friday, and then the same thing on Saturday. They also are given a game status projection for the opposing coaching staff to be aware of with the options of Out, Doubtful, and Questionable. Those terms were redefined in 2016; there used to be a Probable term that the NFL deleted. Now, Doubtful means 0-49% and Questionable means 50-99%.
As an example, here is the week 3 Injury Report for the Panthers.
What this means is:
1) Bryce Young had an ankle injury, did not practice at all, and will not play in the game.
2) Justin Houston was limited due to a calf injury, but practiced fully on Friday and is between 50% and 99% likely to play in the game.
3) Burns, Sanders, and Wooten were limited in practice, but practiced fully on Friday and will play in the game.
4) There was a concern about Barno's thigh, but he practiced fully on Wednesday and Thursday and it was no longer a concern. He willl also play in the game.
The point of these official injury reports which every team is required to make public is to raise the overall quality of play because teams can prepare for who they will actually be facing on Sundays. Occasionally teams have been fined if their "game status" column differs too much from what actually happens a large number of times.
